The "Signal received" death popup

"
The inferior stopped because it received a signal from the Operating System,
Signal name: SIGEGV
Signal meaning: Segmentation fault
"
1: I migrate a USB flash drive between Ubuntu 9.10, Windows NT SP2, and Windows 7; only my program files (*.cpp, *.h, *.pro, etc and what Qt Creator creates for my program) on flash drive. Qt4 itself on each machines main HD.
2: Only doing this in debug mode, not run mode. Run mode is fine.
3: It is doing this with the Qt Creator example programs as well, so far I have tried:
Widgits->groupbox
Main Windows->menus
Networking->HTTP Client
4: Only doing this in Windoze (both), not Ubuntu, but that doesn't suprise me ;)
5: It was all working fine till last week.

I have tried uninstalling and reinstalling Qt4, twice, no luck.
I installed Windows debugging tools, no luck.

Help! Any ideas? I new to Qt4 and really liked the ability to deveop on two machines (one at work and one at home!)

The application is crashing. Probably due to some incompatible libraries or object files. You can check the debugger's backtrace to see where it crashes.