I have been having this issue (maybe non-issue) for some time. Here is my set up: Teensy 2.0 MIDI Device Pd 0.46.7 Late 2013 Macbook Pro
I am using a Teensy MIDI device in Pd. If I connect the Teensy device, then launch Pd, I get the following error message in Pd's print window : could not open midi input 0 (Teensy MIDI): PortMidi: 'Invalid device ID' could not open midi output 1 (Teensy MIDI): PortMidi: 'Invalid device ID' Under my MIDI settings I have "Teensy MIDI" selected both as my input and output. If I re-select "Teensy MIDI" in both dialogs of the MIDI preferences menu, and hit OK the same error message will reappear in Pd's print window. If I select "none" for both input and output I do not get any error messages. Though I get this error, it seems to not effect the use of the device in any way. When I connect the device to a windows machine, I don't have this PortMidi error message. I have also connected this device to my iPhone using MobMuPlat, no issues. Any advice would be helpful. Thank You, Dustin
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