So, I bought Teensy 3.2 and everything works fine except for pin 30. Digital write does nothing and analog read gives me values like anything isn't connected. Why is this a problem? Any help would be appreciated.
I suspect it's possible to kill a single pin with the rest of the chip still OK, by destroying that pin's output buffer, for example by a large enough ESD hit.
EDIT: You can also get the same effect with one bad solder joint on the chip's pin, which you could confirm if you have steady hands and a fine enough probe.