Check for nil — in the set-the-state code add an assertion that 
_onOffSwitch!=nil, and in -setActive: add an assertion that sender!=nil. That 
may help track things down.

(Basically, any time I see a weird bug like “I change a property of ___ but it 
doesn’t do anything” or “a property of ___ is 0/nil but it shouldn’t be”, I 
immediately start wondering whether ___ is nil.)

—Jens
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