Problems with existing document when downloading Zotero 2.1

I have just downloaded Zotero 2.1. Now when I open my Thesis and try to insert a new erference I get the following message:

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This item no longer exists in your Zotero database. Do you want to select a substitute item?

Clicking "No" will delete the field codes for citations containing this item, preserving the citation text but deleting it from your bibliography.
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The Zotero error number is 1749962405.

I do not fancy going throught the whole document again and re-inserting all my references again. Any suggestions on how I can fix this problem?

I have also noticed that when I want to insert a new ref the pop-up window only has author and title under the search result part. Before I was able additional criterias such as date (and so see what the date of that publication was). It this a change that is permanant to zotero 2.1? In this case, how can I download the old version 2.0 again?

Any help welcome
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