Having a second look at the code, your app looks very busy. When does it ever hand control back to the event loop to process events?

My suggestion is to defer some of the movement events by using timers with after or repeat. This will relinquish some control back to the controlling event loop, and it might get a chance to service some events that have been queued up.

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In reply to Re^3: Problems with Tk freezing by rinceWind
in thread Problems with Tk freezing by wulvrine

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