HPL Level Editor AMD Graphics Driver Crash

[JPiiONEFOURONE]

Every now and then, it freezes my computer, and eventually the screen
goes black, then after a few seconds, comes back on saying that my AMD
graphics driver had stopped responding and has recovered. This causes
the editor to stop responding, so any unsaved changes are lost.

You know, this is EXACTLY the thing I've been having too.. The editor worked from 5 seconds to couple of minutes before the black screen happened. This really didn't help when doing an 8-12 hour map project.

Does it only crash when you have lighting in the scene? I found that it works fine up until I add soem form of lighting, like a point light.