"string.length is not a function"

"string.length is not a function"

..thats what is says, when i want to insert a citation in Word. but this only happens, when i'm working on an existing document. when i create a new one, everything is working fine and citations are inserted correctly.
10 minutes ago it was fine too, but then i installed the new update Zotero WinWord Integration 3.0a3. After deactivating that though, nothing works either :/

I am using Zotero 2.0rc5, Win7 and Word 2007.
Any help is appreciated!

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