This has been fixed for the next version (I think). A beta is available if you'd like to try it:When my desktop calendar is being displayed transparently, and I double click a day to bring up the New Event dialog, if I then cancel this dialog (clicking 'X' in upper right) without saving it, it leaves a ghost image of the dialog box over the calendar (the functioning of the calendar itself is not affected by the ghost). This does not occur when I click on "Save and Close."
http://www.vueminder.com/forums/phpBB3/ ... ?f=5&t=817
The desktop calendar has also been fixed so the Show Desktop command shouldn't ever cause the Desktop Calendar to be hidden.