LabWindows 2010, running on XP.
My program has two windows, each controlled by different threads but interacting via TSQ's - The Virtual O'Scope window can operate independently, but it always is opened when the test window is opened. If I run through a whole test, things work properly. If I open the test window, which opens the VOscope window, and then immediately close it, I consistantly get a General Protection Fault in the VOSCOPE window, in cvirte.dll, which crashes the whole program. Any ideas where to look for the problem would be appreciated. I've made pretty sure that all calls to controls in the various panels are made only from the appropriate thread that created that panel - thus the TSQ's.