Hi Sean, Neverness posted that he experienced a problem with closing gtop - the frame remained, though with the content cleared. The same problem arises with e.g. gcolorsel and ickle (GTK app.). The weird is that the frame is still "active" afterwards - i.e. one can right-click it and pull up the menu, but it just will not close - not even with xkill. And the application is _not_ running anymore according to ps.
I know you don't have Gnome installed, but then Ickle may be a possible test-app. (http://ickle.sourceforge.net/) Regards, Martin