I think i found something.
At first i had the Demo to retail problem. After that was solved i couldnt access the options menu and all blocks except on mono was black.
I tried deleting it trough steam, re install, deleting it trough steam and manually reboot, reinstall steam then install but nothing worked.
I saw somthing about options.cgr in i thread and found it in Steam\steamapps\common\audiosurf\engine\Support . What i also found was a much LARGER options.cgr.bak. I deleted options.cgr, made a copy of options.cgr.bak and renamed it to options.cgr and then it all works fine.
Hope this info can be of some use to you.