I have a problem similar to this (hopefully the same issue). Basically my screen locks up. Sometimes I get a few seconds warning because the UI starts to get EXTREMELY slow, gradually worsening, until everything locks up entirely. When this happens I still see the desktop but NOTHING responds, no ctrl-alt-del, nothing. Other times the screen just suddenly goes black and stays black (I've left it for some time to see if it recovers, never does).
I have yet to see any triangle related glitches.
The catch with my issue is that it's only with certain dreams. Right now I'm running "Winter Snow" by Neil Banfield and I have NO problems whatsoever running this. But if I switch to many of the other dreams I've tried, after an hour or so I experience this problem.
To the OP: could you try obtaining Winter Snow to see if the problem is with specific (types of?) dreams? This might clue us in to exactly what the root of the problem is, assuming there's some fundamental difference in how this dream works vs the others that have been blowing up.
I kinda doubt it's my card overheating (or bad), I never have problems with anything else and this Alienware thing I have has fans and liquid cooling all over the place (not on the video card, though). Also my main hard drive is an SSD which puts out less heat. Is there a way to monitor/report the temp of the GPU?
NVidia 8800 GTX
Intel Core2 Quad Q6600
Windows 7 64-bit Ultimate
Mount and Blade Warband
(Oh, was that last part not needed?
)
Edit:
Actually I remembered I have GPU-Z.0.3.8 which is giving me a 62 and 54 degree temp on the GPU, running at 60% fan speed. This is of course on the desktop running the dream I mentioned.