Today, for some reason, any attempt to add a note to a Zotero item causes not only fails but also causes all the other editing tools for the item (info, tags, etc) to vanish as well. The notes pane appears to open but it's actually just a grey pane and doesn't accept any input. Once I've tried to add or edit a note, all the editing tools for that item and all others no longer appear. (Screenshots available - seems I can't post them here).

To add to the puzzle, causing Zotero to go to full screen or back to the lower part of the window and then full screen again restores the editing tools - but they disappear once again as soon as I try to use the notes tool.

Versions:

Zotero 3.0.8
Firefox 17
Ubuntu 10.04

Any help appreciated!

Tom