Title bar buttons flicker in Windows 10

mikemanger posted 2 years ago in General
They still work but the close/help/mini/max buttons all flicker when you hover over them. Seems to happen in all windows (session manager, preferences, etc).

I am seeing this on Windows 10 64bit using HeidiSQL 9.3
ansgar posted 2 years ago
I'm not having that issue here, on Windows 10 64 bit with Heidi 9.3 . Could it be a graphics driver issue? I had issues with my Nvidia drivers on Windows 10 until I had updated my system bios.
mikemanger posted 2 years ago
Yep, working OK for me at home.

I'll check the drivers and stuff tomorrow, could also be from DPI scaling. Seems odd because I'm not getting the issue in other programs.
mikemanger posted 2 years ago
Does seem to be related to the display settings - I had my primary at 125% and my secondary display at 100%. Ticking 'Disable display scaling oh high DPI settings' for heidisql.exe fixes the issue.
abides posted 2 years ago

I have the same problem but its not only heidi sql, all file browser windows and most of the application windows except chrome. Chrome windows and tabs are stand still and almost all other windows title bars flickering.

I realize something, i'm using slideshow desktop background and it does everything when background switch to another.

Probably its related about graphic adapter or windows itself.

here is it video i captured when it happens to show what its look like (skip to 25. sec)

abides posted 2 years ago

everything when background switch to another

*everytime when background switch to another
mikemanger posted 2 years ago
Hey abides, that looks different to my issue which only affects the title bar buttons not highlighting.
qxxx posted 1 year ago


I still have this problem. Updated to The problem shows up sporadically every few minutes but If you want to quick test the issue just start heidi and then change your screensaver! If you change the screensaver while heidi runs everything is flickering. if I close heidi and change the screensaver everything is fine.

Here I uploaded a video: https://www.youtube.com/watch?v=d-PfhE4knY8

Please do something as I am working with heidi every day and it annoys the hell out of me. I reinstalled my graphic drivers and rechecked my system.. after months I finally found the cause of this flickering.. :( (I am on windows 10 but it also was in win 8 a problem)

ansgar posted 1 year ago

Your video shows the issue quite well. Every window flickers when HeidiSQL window is visible. If Heidi is not visible, nothing flickers.

This post says I shall ensure the FullRepaint property of all TPanel instances are set. That is the case, I just checked that.

I could not find any other threads related to flickering Delphi XE5 applications yet.

qxxx posted 1 year ago

@ansgar - thanks for your reply. If it helps: it also flickers when only the connection manager windows is visible and no connection was opened yet (like I just start heidi) - I tried to solve the problem myself but I have no delphi, tried it with lazarus but I am lacking pascal / delphi knowledge ;)

I guess there is like in c++ some kind of a loop that listens for some system specific events and if the event was triggered heidi is doing something that causes the flickering.

ansgar posted 1 year ago

HeidiSQL has some code in a so called TApplicationEvents.Idle event. That is, when the application does nothing, then do something. You can imagine that there is a chance that HeidiSQL does something weird here which could cause flicker, but the code in that event is written very carefully and lightweight.

It is more likely that the action list and imagelist which HeidiSQL has, is updated automatically by the underlying VCL library. For example, updating the enabled/disabled properties of all contained TActions could cause flicker. Indeed, in Delphi, when I add an image to Heidi's main TImageList, I can see a flicker issue for 1 or 2 seconds. Probably this has the same cause as the flicker in Win10.

What I already checked: FullRepaint property on all TPanel's: (was already the case)

There is more to check: DoubleBuffered property on all TMemo's:

physcopanda@hotmail.com posted 1 year ago

I get this too - it's driving me mad - please please fix if at all possible as Heidi is otherwise an excellent tool! Is anyone actively working on this? I do have one 4k monitor and two smaller 1280 x 1024 monitors plugged in so I too have a mix of DPI but turning it off for Heidi is really undesirable!

Keep up the good work guys - it's a really really good product :-)

qxxx posted 1 year ago

Keep up the good work guys - it's a really really good product :-)

agree! in my opinion the best. I tried all similar products, paid and open source and heidi is the best for me. I just wish this flickering could go away. I am running heidi now in a virtual machine on windows 7 so it wont flicker, I am using it a lot. I will try to get delphi somewhere and try to fix the error. Maybe there is a way to set some properties for that imagelist ala autoRedraw = false.. ?

bzoks posted 11 months ago

I also have this problem... if I have more instances of Heidi open (also multi-monitor setup), this flickering off all windows lasts even longer... Best regards, Bostjan

webdbase posted 11 months ago

Yes, I confirm the same behaviour. Is it reletaed somehow to the problem with autocomplete and virtual desktops described at

webdbase posted 11 months ago


joaojacome posted 9 months ago


I fixed the problem by disabling the wallpapers slideshow fade, in the system settings.

1 attachment(s):
  • Screenshot_1
joaojacome posted 9 months ago


I fixed the problem by disabling the wallpapers slideshow fade, in the system settings.

Oops! It's the first checkbox!

qxxx posted 9 months ago


I fixed the problem by disabling the wallpapers slideshow fade, in the system settings.

Can you please test it by activating and disabling the screensaver? I don't think it helps disabling that checkbox in the performance window.

I tried to solve that problem myself but I was unable to get the heidi sourcecodes to work with various delphi versions.. the problem still exists and is pain in the ass. :(

Vanav posted 7 months ago

I confirm this bug. If HeidiSQL is running (it can be minimized), then most of windows, including taskbar, flicker multiple times during some seconds after some events.

Vanav posted 7 months ago

Bug triggers for me:

  • group policy update at regular intervals, can be run manually: gpupdate.exe /target:computer.
  • change any checkbox and press Apply in Advanced System Settings - Visual Effects: see screenshot by joaojacome above.

Environment: Windows 10 Pro version 1607 (build 14393.187), HeidiSQL

I have no screen saver, animation settings made no difference.

Vanav posted 7 months ago

Other related threads:

  • Windows 10 - UI elements periodically flickering - Super User - superuser.com/questions/1011142/ui-elements-periodically-flickering
  • The system slows down and the gui flickers while it repaints itself - Microsoft Community - answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_perf/the-system-slows-down-and-the-gui-flickers-while/556f860f-0057-4d67-bfcc-2de06527b801
  • Bug: HeidiSQL causes slowdowns on Windows 10 - www.heidisql.com/forum.php?t=18120
  • Menu and bars are flickering under Windows 10 Insider Preview 14342 - www.heidisql.com/forum.php?t=21342

(I'm sorry, forum doesn't allow me to post links).

qxxx posted 7 months ago

Hi everyone. Can it be that it was fixed? Because I don't experience that issue for weeks (months?) anymore.

Everything still flickers if I change the screensaver but it doesn't flicker on its own now, which was really annoying. That method with changing screensaver is just to force the flickering caused by heidi. I am happy that it doesn't flicker on its own now every few minutes!

Thank you to devs for fixing this. :)))

ShirleyFWilliams posted 7 months ago


mikemanger posted 7 months ago

I just tried and my issue with the title buttons is still happening

1 attachment(s):
  • flicker2
qxxx posted 7 months ago


what should it do? (or not do)? You are hovering the top right buttons, I don't see any issue there, only that the hovering is not always executed? Just tried it on my machine and it looks like this:


qxxx posted 7 months ago

I just realized the issue from @mikemanger and my issue are different 2 cases.. my problem is (was?) that the every window (not just heidisql) was flickering every few minutes when heidi was running. And @mikemanger has an issue with the buttons. Sorry for the confusion and that I stole your topic for my own problem ;) I hope it gets fixed what you are experiencing

mikemanger posted 7 months ago

No problem - my fault for not posting a gif originally (I don't think the technology existed back then :P).

Yes, my problem is the hover state isn't kept - it just flickers on and off when the mouse moves. I can fix it by disabling DPI scaling on the .exe and it works fine (but obviously the window is not scaled).

Glad the other issue is fixed now tho.

Vanav posted 7 months ago

Issue about all windows flickering every few minutes is not fixed. But it is triggered periodically only in some environments. I've collected some known triggers above, including periodic ones (domain group policy update).

apric posted 6 months ago

The global flickering happens reproducible when resuming from sleep, even when HeidiSQL window is not directly visible. Every open window flashes uncontrollable for a few seconds.

wolis posted 6 months ago

Setting up Sticky Keys will cause this:

Control Panel\All Control Panel Items\Ease of Access Centre\Make the keyboard easier to use

  • Click on: Set up Stick Keys
  • Click on: first checkbox (toggle on or off)
  • Click on: OK and screen elements like title bars and task bar and some windows will flicker.

Go back in and toggle it again and it will flicker again - very reliable. Exit HeidiSQL and there is no flicker.

qxxx posted 5 months ago

I just uninstalled heidisql.. and bought commercial app (SQLyog).. Heidi is a cool software but I can't work with all the flickering. :/

UB@HS posted 2 months ago

This always happens on our site, when heidisql is open and group-policies get aplied (about every 15 minutes). Especially group-policies dealing with registry-entries or drive-mappings seem to cause the flickering. When no heidisql-instance is running, nothing flickers.

Each additional instance of heidisql causes the flicker to appear with a lower frequency, but making the whole system less responsive.

I assume that heidisql performs as some kind of "event-multiplier". It fires broadcast-events to all other processes, when some kind of external system-event arrives.

It´s really a pain in the ass.

Is someone still working on that issue?

ansgar posted 2 months ago

That someone could only be me, but I don't currently. I was watching out for different suspicious automatic things which HeidiSQL does in the background. But without luck. Probably now that I am soon on Windows 10 finally, I will get some more background on what could cause the flickering.

apric posted 2 months ago

Problem is easily reproduced by changing mouse speed in Windows mouse settings and hitting "apply". With HeidiSQL open, everything flickers for a few seconds like crazy until the settings are actually applied. Without HeidiSQL open, the settings are being applies instantly, no flickering.

ansgar posted 2 months ago

Nice reproduction recipe. I can reproduce that issue here exactly as you say.

ansgar posted 2 months ago

In the just added r5161, I am activating a "DoubleBuffered" property on the dialogs, which can probably help a bit against that flickering.

Btw, the Delphi IDE is even more flickering than HeidiSQL.

Will check further things.

TomasB posted 2 months ago

Hi Ansgar, after installing the latest version I'm getting this toolbar on Win7.

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  • 2017-03-07_084645
ansgar posted 2 months ago

Yes, seems that does not work as expected. Will roll back this change.

ansgar posted 2 months ago

I just reverted that change in r5162. Please update.

Vanav posted 2 months ago

I have no issue with toolbar. Flickering become a bit less annoying, it seems, but not fixed yet.

ansgar posted 2 months ago

r5165 adds my above mentioned modification again, but this time only on Win10.

Misha v.3 posted 2 months ago

Wow. I even did not realise that this the flickering was caused by Heidi. Anyway, it is much better now. Many thanks.

P.S. I hope it will be completely fixed one day.

rahulbhojwani posted 1 month ago

I am also facing the same issue from a long time. It's really frustrating. Let's see what happens after I update to r5165. I will keep you guys updated. I am sure we all can put our efforts and make sure this is fixed forever. And Thanks @ansgar

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