Process for it to crash:
1) cntrl + left click on a fixture
2) cntrl + left click on a different fixture
3) cntrl + left click on the same fixture in 2 will cause the app to crash.

This happens on windows xp, 7, 8, and 8.1
Not a big deal easily preventable since it is mainly provoked by the user, but useful if selected the wrong fixture.
I just tried this same thing with ShowExpress v6 and it is fine.
Matt,
FBC Kissimee
Sound, Lights, and Visual Specialist