zotero doesn't start after upgrade from last beta to rc5

polar
Hi all,

after updating zotero on one of my machines (windows xp, firefox 3.5.5) zotero doesn't start at all anymore. I can access the preferences via the tools -> addons menu but there is no zotero-icon in firefox nor menu entry.

In the logfile extensions.log I found:

2009-09-01 11:04:31 - safeInstallOperation: failed to back up file: C:\Dokumente und Einstellungen\USER\Anwendungsdaten\Mozilla\Firefox\Profiles\043ffcaj.default\extensions\zotero@chnm.gmu.edu\chrome\zotero.jar to: C:\Dokumente und Einstellungen\USER\Anwendungsdaten\Mozilla\Firefox\Profiles\043ffcaj.default\extensions\zotero@chnm.gmu.edu-trash\chrome ... rolling back file moves and aborting installation.

Deinstallation und Reinstallation didn't help. Only deleting the whole mozilla-folder gave me a working zotero. But at the cost of loosing my whole preferences.

thanks for ideas

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