[keenannick]

No luck with this tack... though you seem to be dealing with a similar problem after upgrading iCal, and my iCal has (I think) stayed the same.

So far I have tried:

1. Rebuilding OF Database
2. Reopening OF Database after backing up
3. Resetting iSync
4. Rebuilding iCal Database from Backup

and nothing seems to change the problem.

On the bright side, although it's erasing the data coming from iCal, it is still linking the matching to dos in iCal and OF. The iCal task (now named "@context: (null)") still has the tracking URL ('omnifocus:///task/nZ-5bFIs5fq', for example), which does link itself back to the OF task.

Any new tasks or task updates from OF sync normally.