[ptt-users] Linux TestMaker - getting blank windows

[Norm Dressler]

Probably a known issue, just not to me - I've installed TestMaker onto
my Mint Linux (Ubuntu derivitive).  

Some windows, in particular when I try to exit come up completely blank.
I can't close them, and can't get around them normally.
java Version:
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

Thanks
Norm Dressler