Hi Ruurd, I don't currently know of how that problem could happen with the trial version, but that exact problem does frequently happen with cracked versions though.
You might try updating your video driver - it's not uncommon for video drivers to have bugs in them and they can sometimes make for some unpredictable behavior.
Try going directly to your video card manufacturer's web site and downloading their latest drivers and see if that helps stabilize things.
If that doesn't help then try temporarily disabling any kind of software that you might be using that might hook into programs, stuff like virus checkers, anti-spyware stuff, or stuff like that to see if some interaction with that software is causing a problem.
- Michael
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