Hog4 Crashing in Fixture Builder

I have been working a bit in the fixture builder, creating fixture profiles for a lot of our (strictly FX) custom gear. The profiles have been coming out fine but the system seems to crash about 50% of the time, either when I hope the fixture builder, or when I finalize the fixture builder by hitting "Build Fixture." When it crashes, the screen just goes black and all I can see is the mouse cursor on the screen, nothing else, and have to manual turn off the console and power back on. Anyone else having these issues?