Zotero 3.0 update - will not open classic view window

Hi, I am running Zotero standalone on Mac osx 10.6.8. with word 2008. I have experienced no problems until I installed the automatic update for zotero 3.0. I restarted word, then my computer. However, whenever I click to go to classic view (which I need for inputting page numbers) the window appears for a second and then vanishes. It is not behind any other windows.
Can you troubleshoot for this problem, or equally, tell me how to revert to the pre-update version which was working perfectly.
Thanks,
Ricky
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