Since upgrade of Linux I have a lot of problem with Eclipse in Ubuntu 9.10 (Karmic). First of all buttons are not possible to press any more. But I also have an issue with that it is very slow. Other people also seem to have the problem and have posted workarounds, but none of them has done the trick for me so far.
At work I use Quanta Plus instead at the moment, and I kind of like it. Would love to have it on OS X and Windows too though.