Hi folks,
I have seen this behaviour after upgrading from 12.0.0.6468 to 12.3.0.6589. The same version Rikai.Design used and he failed also but TTSneko had no issues. Strange. Ansgar mentioned, this is an issue of v11 but as v12.0 worked for me and 12.3 not, there might be a new regression or any side effect caused by ... OS? By the way, I used HeidiSQL on HP Notebook with up-to-date Windows 10 and nVidia Quadro P600. Downgrading to 12.0.0.6468 solved the issue on the HP Notebook.
A quick Test on a Lenovo Notebook with W10 and nVidia Gforce RTX 2060 showed the same problem with 12.1.0.6537. Upgrading to 12.3.0.6589, same problem. Downgrading to 12.0.0.6468 and the problem was solved.
In short words, at least for me it looks like a regression between 12.0.0.6468 and 12.1.0.6537. I did not check any nightly.
Hopefully, this helps to discover the issue.
Thanks for this incredible piece of software, I (not only) should really think about donating.