I've had automatic updates enabled on my Ganymede install of Eclipse. Huge mistake. Today a Subversive upgrade moved me into an unworkable state and I lost some development time recovering. My experience seems similar to the problem discussed here. Even a fresh install of Eclipse failed to correct the situation. Maddening!
In any event, here's how I was able to finally recover:
- Open Time Machine
- Restore ~/.eclipse
- Pat self on back for using a Mac
What? You don't use a Mac? Why? Well, you might be able to use Eclipse's Software Updates -> Installed Software -> Revert Configuration button to rollback the upgrade. Good luck with that...