'CALayerInvalidGeometry' Error using GUI on macOS

[interrogator]

With macOS Sierra, I'm occasionally getting a weird error:

python[72551:32862168] *** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [0 nan]'

It's to do with the version of Tk that Apple ships. What may fix it is installing ActiveTCL:

http://www.activestate.com/activetcl/downloads

More info here: git/git-scm.com#853

[Thierry46]

Hello everybody,
This exception on Mac OSX Sierra
... 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan 0]'
can now be solved by upgrading to the lastest Mac OS version available on Applestore : Mac OS 10.12.2.
Best regards Thierry.

[interrogator]

Thanks for this report. I'll do some checks soon as close this if all works properly.