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Originally Posted by Kane View Post
Exception reading XML: Unable to parse XML (status=10, index=1, line=1, error=Encountered unexpected character 0x0 ('') at top-level)
This indicates that one of the transaction files on your disk is corrupt, so OmniFocus can't rebuild its data cache from it. (In daily operation, OmniFocus doesn't have to read those transactions—so, unfortunately, it may have been corrupt for some time without the previous release realizing there was a problem.)

OmniFocus makes automatic daily backups of all your data, so you should be able to recover your data from the latest one: choose "Revert to Database Backup" from the file menu, then navigate to "OmniFocus Backups" in your Documents folder and choose your latest backup from it.

(And I think I'll now file a feature request that OmniFocus make a backup of your data whenever it updates itself, to guarantee that you have a completely current backup.)