As found by SOPM :)
Go through all the IDE options continually and after a while there is a slowdown and eventually no menu is selectable...
Minimise GLBasic and restore it and the editing and output window areas are corrupt.
http://www.glbasic.com/forum/index.php?topic=7823.0
I just think the link should been there where this typic started.
I have not seen this issue at all, so?
Many people have though!
Happened on my Windows 7 x64 machine - going to see if the same thing happens in Windows 8...
The 32-bit version doesn't do it, so I wonder if its an x64 thing ? :)
It also seems to be caused by multiple uses of Find (and possibly Replace) too...