Claws Mail freezes in certain situations running on Ubuntu 12.10 Quantal Quetzal.

I can reproducibly cause a crash by attempting to create a new filter rule. The Claws Mail windows will become totally unresponsive. The only solution is to "sudo killall claws-mail".

This issue has been reported by someone else on Ask Ubuntu:

However, unlike reported on Ask Ubuntu, the freeze does not depend on the user making a "mistake", it occurs every time a filter rule is being created.

It is suggested that this problem is related to Unity.

Does anybody know a solution?