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Hi all, I got a strange queue behavior that is probably related to race conditions. The problem is eliminated (a way around is found), so there is no need in a quick solution. However, I would be happy to understand reasons for such a phenomenon. BD of the â€œproblematicâ€ VI is attached. The queue size is limited to 1. The program consists of multiple asynchronous processes. Execution reaches the Enqueue Element node than stops. The timeout never happens; the program hangs. However, there is more. If I try to execute the VI step-wise, everything works fine until the execution enters the internal Case Structure. When it enters, three Stepping buttons become disabled. If I try to decompose the program, i.e. to use the same VI in a simple single-process program, both problems disappear. Have you encountered such a strange behavior? Any ideas that can help to the poor creature (me) to avoid sleepless nights?