You have succinctly described the same problem I have.
webflow 2.0m1 adds a "guaranteed cleanup" listener for JSF. I have not tried using it yet and I haven't investigated its function fully. I would like to explore this solution with you further. Thanks.
Thanks for this information. I will try it out and give you the response a.s.a.p.
I have now found a solution for the problem.
The problem is the version of the myfaces jar File in the example project.
When you update the myfaces Jar files to version 1.1.5 the example is working fine.