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Logisim is software for designing simple and advanced logic circuits such as RAMs, Registers, CPUs, etc.

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What is wrong with my D flip-flop toggle switch?

I duplicated your circuit in Logisim (as an opportunity to do something in Logisim). There's nothing wrong with your circuit. There is something about Logisim I don't understand. … Just in case this has been addressed in a later version, I'll note this Logisim is 2.7.1 Update: I "fixed" the problem (within the scope of this simulator, anyway) by inserting a NOR gate in the feedback …
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