Well… I just discovered this recently. When I close GDevelop, I can’t run GDevelop the next time I wanna open it because of the process GDIDE.exe still exists in the processes of the OS. I wonder if you can solve this issue right away. This issue exists in all version of Windows OS (regardless if XP, Vista, 7, or 8).
Yeah… a (well) known bug 
[url]gdevelop don't close still running]
Try to update your drivers, the bug is hard to catch, it happens only in some computers.