Upgrade StorageNo entries displayed with Windows XP and Firefox 10 update
I run XP on my laptop and after the Firefox 10 update nothing is visible in any of the Zotero panes - no libraries, tags, or bibliographic entries. It looks as if it is a fresh install of Zotero. All is ok on my desktop (XP as well) since it is still running Firefox 9. I am running Zotero 3.0.3
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http://www.zotero.org/support/zotero_data
I'd suspect it looks "fresh", too, i.e. with nothing in the storage folder (or maybe no storage folder at all).
If I'm right, for whatever reason, Zotero is pointing to a different data directory than before. That's not something that changes during the Zotero update (or the FF update for that matter), so we can't help you much with this, except to suggest you look for your old zotero data directory.
If all else fails, you can use the information in the link above to just copy over the database from your desktop.