EAP of TeamCity (4) web ui does not want to save mstest assembly list

Hi,

In the web ui, for sln 2008 build runner configuration, i enable mstest, and must provide a list of assemblies containing tests. However, the ui does not want to save settings, even if there
one or more assemblies.

Any idea how to fix this, or what config file to edit manually in order to properly configure mstest support ?

thanks a lot.

Andre