Hi, this is similar to another bug report here, I'll add the number shortly. Using OOo writer 3.1.1 , Firefox 3.5.7 and Zotero 2.0rc5 I get an error refreshing or performing any Zotero operation on one of my documents. I'll try reverting to a previous version shortly as I think only partly completing inserting a reference before saving might have caused the problem - I'll see if I can reproduce it.

The error first comes up with a long error report in a dialog then a shorter dialog saying

"Zotero experienced an error updating your document.
fields is null"