There a 6 posts on this Devs website concerning this issue that I am also having. First on on Nov 5, 2011 and as of today Mar 12, 2012, Dev has not responded to any.
Does not recognize any category or even all category's (Display all). Just shows "..."
I really hate to review (bad) Non-Commercial Devs, but if you are going to put your stuff out there, at least occasionally acknowledge your users issues.