Thanks for the kind feedback guys. I'm happy that you like it!

Concerning the issues: Must be a Nvidia problem in combination with Win7 x64 then. IIRC there was a similar problem once, which could be solved by opening a 16 bit instead of a 32 bit screen. (never understood why though) I'll try to upload a "fixed" version this evening. All in all it's quite funny, that it works better on old machines than on new ones...

Is it software rendered?
No. It's actually 3D accelerated. No clue why it's so slow or not working at all on modern PCs (it's kinda hard to debug with two machines, which run it flawlessly...

) Let's see if the "fix" will cure the problem. *crossing fingers*