Hi together,
At the Ubuntu Document Storage Facility(doc.gwos.org) are instructions to bypass this incombatibility between the native dri code and fglrx with amd64 [...]AFAIK, the 8.18.8 minor update was released exactly to fix this problem and 8.19.10 is *definitely* meant to fix this (see the release notes). I don't think Tobias' problems are caused by this; unfortunately, I have no clue as to what the cause could be either.
apt-get install --reinstall libstdc++5 solved the problem. 3d now works :-) Thanks a lot, Tobias