Group libraries not appearing in left pane

Using firefox 3.6 and Zotero 2.0 none of my groups appear in the left pane. I get no sync errors or any other sort of errors, just nothing in left pane. I installed Zotero for a new firefox profile and that seems to work, but would rather use zotero with the old profile as have lots of other things set-up in it. Any ideas?

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