When I am in the dashboard looking at all my posts, and select a category from the drop down, then select "filter, the view reloads, but it still shows all categories.
This occurs with all plugins disabled.
I just now pulled the latest from svn and tried it again, and no go.
The following information is POSTed when I press "filter":
Here's the actual string:
So I can see it's sending the 'cat' along with the post, it's just not doing anything with it.