i made a movie to show you how clear the cache set player preferences and how know the version of DX.
just wait the time to see it 
the folder where deleted files to clear the cache of DX:
C:\Documents and Settings\%Username%\Local Settings\Application Data\Stardock\DesktopX\CurrentTheme
be sure DX is unload before clear the cache.
then after reload it and your object/theme.
If it's a widget the folder is there:
C:\Documents and Settings\%Username%\Local Settings\Application Data\Stardock\DesktopX\WidgetCache
delete the folder of your widget (be sure it is unload too)
then after reload it.
Don't worry that only clear the "temp" files not the widget/object/theme itself

then for the other see the movie and let us know your DX version and if that run or not.
to see it in full size go here