No connection to Zotero in word-plugin while offline
I am not sure this is really a sync-problem, but I send it here as it is sync specific: Word-plugin does not work when you are offline. Says "An error has occurred communicating Zotero. Please ensure Firefox is open and try again." Zotero version 1.5a1.r3257, plugin version 1.0b3. Sync-preview itself does not mind at all being offline.
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Upgrade Storage
http://forums.zotero.org/discussion/1155/?Focus=15095#Comment_15095