Sync Error w/ 2.0b7.5 - empty response from server

Updated both PCs. First syncs went fine on both. Later, tried sync again (I have both set to manual sync) on the 2nd PC and got a "Empty Response from Server" error message.

Restarts of neither Zotero alone or Firefox resolved the issue.

Now getting same message on 2nd PC. Again, restarts of neither Zotero alone or Firefox resolved the issue. Help?

1st PC:
Report ID: 78498046
Debug ID: D64286971

2nd PC:
Report ID: 622238705
Debug ID: D347349745.
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