The "Signal received" death popup

[CrazyDave]

"
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!)