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I updated the script to 3k. Now the behaviour is very odd :
Python 2.7: works only if `justify="right"` is commented out.
Python 3.3: Shroedinger-like behaviour (sometimes dead, sometimes alive, nobody knows before we check) whith `justify="right"`
Looks like some kind of race-condition or something, so this results may only be relevant on my hardware (2 yo low-end PC).
I'm not a tkinter expert, so even if the app code looks good I need someone that knows tk to double-check if there is some oddities in the script before we go further.