I've upgraded to Eclipse Kepler from Juno, and I find that it handles the Esc key completely differently.
Usually, with the Esc key I could abort smaller views/menus like auto-completion: Alt+Space to open the auto-completion dropdown, Esc to close it.
However, with Kepler I find that Esc hides basically everything. Before:
After:
Esc is not mapped to any function (it's not listed in the configuration under keys). Is this the default behavior now? Does anybody else have this?
Resetting the perspective doesn't change this behavior. I think it might have something to do with the floaty windows style. When I installed Kepler and started it up, I had to manually resize the inner window (containing all the usual views) to the size of the screen.
Edit: I can get the UI back if I click the small Java perspective button in the little menu bar on the top left side. The Esc functionality seems to be the same with all the views (focusing each view, then pressing Esc does the same for every view).