full screen shortcut inconsistency on Mac

Hi,
I'm using Zotero 1.07 on a Mac with Firefox 3.04

When switching to full screen mode, the shortcut for closing/opening Zotero doesn't work consistently: it will work once, then it won't work again, unless i change tab (or window), then if i go back to the previous tab it will work again, but only once.

Is anyone else experiencing the same?

Thanks, and keep up with the fantastic work!

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