yes it is definately the program. It was written in the w95/98 era and slightly updated for vista. It doesnt work well with windows taskbar either however actual multiple monitors taskbar works fine.
It also has issues with groupy I made a post about it some time back.
Link to TIGCC which GCC4TI is a fork of.
Here's a link to the github repo for GCC4TI
And here's the groupy post i made before Incompatibilities with GCC4TI in groupy
I have no idea how AMM works around it and they haven't responded to me. I do know the IDE is written in pascal and the main window of the ide is actually an "owned" window of a hidden top level window. It's that owner window that gets the TB button. Not sure what (if anything) can be done but I really dont want to have to write another IDE to replace it with lol.