Hi Peter, Thank you for your extensive reply. In the meantime, I solved the problem. I had started out to trace the path of the randomly arriving external data through the different threaded processing stages. After one of those 'hangs', with some luck, I was able to spot the cause of the trouble: a piece of old code that wasn't supposed to be out there! Really dumb. FYI, to my surprise, Python really quit. No more CPU time, no message, nothing. I can't recall having seen this before. You are quite right about queues. I use these extensively and carefully. This kind of enabled me to trace the path of the externally triggered events without too much of a hassle. Thanks again, malv
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