4051 multiplexer not working correctly with teensy 3.1, but works with arduino

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@zalterman,
For the OP of this thread.

ALL inputs to CMOS devices MUST have an input applied or you will get UNDEFINED operation of the device. I see on the breadboard only some of the inputs have connections. Use a ground and pull the rest of the inputs to ground.

I have a CMOS book somewhere that talks about this, but I found this:
http://books.google.com/books?id=0g...puts must have something tied to them&f=false

I think this includes HC and HCT devices as well.
 
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