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Heisenbug Article Talk XA For the Linux distribution codenamed Heisenbug, see Fedora Linux. Not to be confused with Heisenberg. In computer programming jargon, a heisenbug is a software bug that seems to disappear or alter its behavior when one attempts to study it. 1 The term is a pun on the name of Werner Heisenberg, the physicist who first asserted the observer effect of quantum mechanics, which states that the act of observing a system inevitably alters its state. In electronics, the traditional term is probe effect, where attaching a test probe to a device changes its behavior.