Exception when dropping database

Everytime I try to drop a database I get the following exception. Target system is a Debian machine running mysql 5.5.35. Colleagues report the same issue on different (but similar) client machines (on the same server).

date/time : 2014-09-15, 10:06:42, 60ms
computer name : ****
user name : ****
registered owner : ****
operating system : Windows 7 x64 Service Pack 1 build 7601
system language : Dutch
system up time : 3 days 16 hours
program up time : 43 seconds
processors : 4x AMD A8-5600K APU with Radeon(tm) HD Graphics
physical memory : 5223/7602 MB (free/total)
free disk space : (C:) 38.56 GB
display mode : 1920x1200, 32 bit
process id : $12a4
allocated memory : 84.73 MB
largest free block : 8185.55 GB
executable : heidisql.exe
exec. date/time : 2014-01-25 12:34
version : 8.3.0.4694
compiled with : Delphi XE5
madExcept version : 4.0.8.1
callstack crc : $f900cd5f, $317d2bc7, $317d2bc7
exception number : 1
exception class : EArgumentOutOfRangeException
exception message : Argument out of range.

main thread ($1094):
00a7edb5 heidisql.exe dbconnection 728 +0 {System.Generics.Collections}TList<dbconnection.TDBObject>.GetItem
00bf9dbf heidisql.exe Main 5056 +5 TMainForm.ListTablesInitNode
008caef5 heidisql.exe VirtualTrees 22106 +2 TBaseVirtualTree.DoInitNode
008d10e6 heidisql.exe VirtualTrees 24498 +8 TBaseVirtualTree.InitNode
008e7d65 heidisql.exe VirtualTrees 34134 +5 TBaseVirtualTree.ValidateNode
008e7d12 heidisql.exe VirtualTrees 34115 +9 TBaseVirtualTree.ValidateChildren
008e5b65 heidisql.exe VirtualTrees 33348 +18 TBaseVirtualTree.Sort
008e5d1d heidisql.exe VirtualTrees 33401 +1 DoSort
008e5e50 heidisql.exe VirtualTrees 33427 +11 TBaseVirtualTree.SortTree
008da601 heidisql.exe VirtualTrees 28206 +35 TBaseVirtualTree.EndUpdate
00bf94a6 heidisql.exe Main 4975 +49 TMainForm.ListTablesBeforePaint
008c8a49 heidisql.exe VirtualTrees 21198 +2 TBaseVirtualTree.DoBeforePaint
008e136a heidisql.exe VirtualTrees 31781 +5 TBaseVirtualTree.PaintTree
008d3137 heidisql.exe VirtualTrees 25419 +22 TBaseVirtualTree.Paint
006a3da6 heidisql.exe Vcl.Controls TCustomControl.PaintWindow
0069ab53 heidisql.exe Vcl.Controls TWinControl.PaintHandler
0069b9ef heidisql.exe Vcl.Controls TWinControl.WMPaint
006a3d38 heidisql.exe Vcl.Controls TCustomControl.WMPaint
008c5071 heidisql.exe VirtualTrees 19414 +8 TBaseVirtualTree.WMPaint
0040ca5e heidisql.exe System TObject.Dispatch
006931f3 heidisql.exe Vcl.Controls TControl.WndProc
0069a8be heidisql.exe Vcl.Controls TWinControl.WndProc
008d7a3b heidisql.exe VirtualTrees 27144 +32 TBaseVirtualTree.WndProc
00699afa heidisql.exe Vcl.Controls TWinControl.MainWndProc
005da433 heidisql.exe System.Classes StdWndProc
772f11f1 ntdll.dll KiUserCallbackDispatcher
771b27b5 USER32.dll UpdateWindow
771b3b73 USER32.dll CallWindowProcW
0069aa59 heidisql.exe Vcl.Controls TWinControl.DefaultHandler
0040ca6c heidisql.exe System TObject.Dispatch
006931f3 heidisql.exe Vcl.Controls TControl.WndProc
0069a8be heidisql.exe Vcl.Controls TWinControl.WndProc
00699afa heidisql.exe Vcl.Controls TWinControl.MainWndProc
005da433 heidisql.exe System.Classes StdWndProc
771b6ba8 USER32.dll SendMessageW
00711f67 heidisql.exe Vcl.ComCtrls TCustomTabControl.SetTabIndex
00714b60 heidisql.exe Vcl.ComCtrls TPageControl.SetTabIndex
0071429a heidisql.exe Vcl.ComCtrls TPageControl.SetActivePage
00c152c4 heidisql.exe Main 10125 +3 TMainForm.SetMainTab
00c09603 heidisql.exe Main 7682 +135 TMainForm.DBtreeFocusChanged
008ca120 heidisql.exe VirtualTrees 21679 +2 TBaseVirtualTree.DoFocusChange
008d0a6c heidisql.exe VirtualTrees 24334 +243 TBaseVirtualTree.HandleMouseDown
008c53dd heidisql.exe VirtualTrees 19513 +11 TBaseVirtualTree.WMRButtonDown
0040ca5e heidisql.exe System TObject.Dispatch
006931f3 heidisql.exe Vcl.Controls TControl.WndProc
0069a8be heidisql.exe Vcl.Controls TWinControl.WndProc
008d7a3b heidisql.exe VirtualTrees 27144 +32 TBaseVirtualTree.WndProc
00699afa heidisql.exe Vcl.Controls TWinControl.MainWndProc
005da433 heidisql.exe System.Classes StdWndProc
771b98d5 USER32.dll DispatchMessageW
00812a4f heidisql.exe Vcl.Forms TApplication.ProcessMessage
00812ac3 heidisql.exe Vcl.Forms TApplication.HandleMessage
00812faf heidisql.exe Vcl.Forms TApplication.Run
00c36c57 heidisql.exe heidisql 77 +24 initialization
770959eb kernel32.dll BaseThreadInitThunk