Cannot rename collections

I just downloaded Zotero, and I'm so excited to start using it, but then I ran into a snag. I cannot rename collections. When I ctrl-click on a collection, the only options presented are New Collection, New Saved Search, and Export Library. Any ideas about why this is happening? I'm using Zotero 1.5-Sync 3.6 with Firefox 3.0.5 on Mac OS X Leopard.

Thanks!

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