IntelliJ, Alt+Enter doesnt work

Question

When working with IntelliJ on a JavaProject it shows to use alt + enter to import a class for example, but this isnt working anymore.

It worked in the past, but something must have changed,
-the shortcut is still set,
-other shortcut would work
- i cant assign alt+enter manually, although if i reset it to default it gets set to it,

any ideas how to fix my problem?
btw my keyboard layout is german, but i dont think it is the problem because it worked in the past, my os is win 7.

edited: when i am working within the IDE and i e.g. write
Arrays.toString(a);
and didn't import "java.util.Arrays" yet, the IDE says:

" ? java.util.Arrays? Alt+Eingabe"    (Eingabe = Enter in German)

so when i assign a different shortcut it works, but with Alt+Enter it doesnt

thanks in advance for any help.

Answer 1

"Well, it means IDE doesn't see the shortcut for some reason. Probably it's already used by some other application or the operating system. – CrazyCoder 25 mins ago "

i closed all applications and it turns out that, Facebook GameRoom, running in the background, somehow is the reason the shortcut doesn't work, i have no idea why, but thats the solution

many thanks to CrazyCoder