Quiller: I just tried the demo on my 2 systems and it does not change the refresh rate on either of mine. Strange.
As far as crashes, what does it say? An error message? This is an unusual report, so I want to help you out. Most have reported running the demo fine. If it is just a sudden crash, then something you may be running the background may be interfering with it. Do you have file lock or protection programs going with an anti-virus program? Heavy, intensive programs like Word or messaging things like ICQ and the like? Lots of different programs running at Start-Up? These can interfere with many programs and cause strange behavior.
That said, with the full Version i'll try to code assuming people have other things running in the background to make the game more friendly to other running tasks.
I only say it might be your system mainly because i'm sure if it crashed on the first or second fight for everyone or most everyone, i'd have heard an earfull about it.