Well, indeed that was the problem! If I set -borderwidth => 2 Then it all works as expected. The message only occured for me when the button was clicked to make a selection (the down arrow button). I haven't had a chance to install the module on any of my *nix boxes yet, but I will do so and file a bug report with the author after some more testing.

Thank you for taking the time to look at the code!

jdtoronto