Comment 9 for bug 880703

I upgraded to 11.11 several weeks ago, and everything has been working fine. My calendar is just a default calendar on this computer (that is, not a google calendar as in the original report). Just yesterday it started happening, and now I cannot add any calendar events, which is going to be quite a problem. Creating a new calendar is not really a viable workaround.

As was mentioned, after the first (do-nothing) click on accept, the factory process is still running. After the error, that process is gone and a new one has been created.