firefox hangs when exporting library

I have a problem that looks exactly like the one discussed here in 2006:
http://forums.zotero.org/discussion/149/reexporting-to-same-library-fails/

I managed to export my library once, a week or two ago, with notes and files attached, but now when I try to re-export my library (to make a backup) firefox hangs with the export status window open. The status bar stops moving. It happens every time I try to export with both notes and files attached.

I'm running Sync 3.8 in Mac OSX.

Any suggestions? Thanks.

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