Eclipse shortcut keys are not working suddenly in Windows, Even basic needed shortcut keys also like 'ctrl + F' or 'crtl + c'. I hope if i restart the eclipse it will resolve, but i can not do, bucause my applications are running in eclipse. I ensured that this happening in eclipse or all windows. But not happening same in notepad++ editor.
It looks wonder but it happening.
This is a bug in Eclipse Juno, restarting Eclipse does solve it temporarily, I'll try an dig out the bug report.
Bug report https://bugs.eclipse.org/bugs/show_bug.cgi?id=385278
Comment from bug description...
I am also facing a lot of problems regarding the keyboard shortcuts. The issue is intermittent and all of a sudden most of the key board shortcuts(specifically f3, ctrl+D, ctrl+O ) stop working unless I restart my IDE.
My problem was solved when I restored defaults values of my Keys.
Go to Window -> Preferences -> General -> Keys.
Then, click Restore Defaults button at the bottom, and restart Eclipse.
I am using Eclipse Juno.
Based on the link posted by david99world
Changing perspective and going back does also solve this, that does looks like is a focus problem.
My problem was solved this way: Go to Window -> Preferences -> General -> Keys
and look at the "Scheme:" control. Change it to "Default". If only that doesnt do it for you, in the field "Binding:" leave it blank.
For me it worked.
I downloaded latest Eclispe June, I started using, I did not get same problem again. I installed latest Eclipse 4 days back. Still, i did not find same problem again. Thanks
来源：https://stackoverflow.com/questions/18978159/eclipse-shortcut-keys-are-not-working-suddenly-in-windows