Translators don't work with beta version (pubmed, pubget ...)

I have upgraded Firefox to 4.0b11 and zotero to latest 2.1 beta. Now I can't save any reference from pubmed or pubget. The translators seem not to work properly even zotero says that my translators are up-to-date.
Here is my Error ID: 1784557135.

Thank you for instant help!
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