04.05.18 23:15, Skip Montanaro пише: > I forgot to mention that when running on Linux (displaying back on > Windows), the Python 3 version (3.6.4, Tk 8.6) does cover all three > screens. The Windows Python 2.7.14 version with Tk 8.5 has problems. Try to upgrade to 2.7.15. It should be shipped with Tk 8.6.