Hi,
I'm not sure whether this has already been reported (if so, please disregard) but I am currently running version 2.4.2.0 of Mezzmo and I have noticed that when you open the Tools -> Setup Your Mezzmo Library... dialog box, all the folders I have added are not showing - the list is empty. If I add a new folder, it initially shows as the only item in the list, and when I hit OK to close and then I re-open it again, the list is empty once more.

Peter