Can not type 'at' key in editor

Hi,

my @ key works on all app on my new mac pro. Except on RubyMine the '@' key (typing ALT-g) pops up the 'Go To' menu??
I have my mac set to english language and swiss german keyboard.

NOTE: The menu drops down from the mine-window, not the menubar!

This seems for me  lile a show-stopper for ruby mine!

Any idea??

Thanks a lot
Martin