One problem that popped up with the Dapper upgrade on one of my machines was with the binary ATI driver fglrx. The end result is many applications fail to launch. If you try to launch them from a command prompt then you get a string of errors, all beginning with: [fglrx] API ERROR
I found a very easy little fix.
cd /usr/lib
sudo mv libGL.so.1.2 libGL.so.1.2.bak
sudo wget http://www.ground-impact.com/libGL.so.1.2
When it's done downloading, you're ready to go. No further action needed.
This was adapted from a post I found in the ubuntu forums.
Posted by Pat McKay 
