Well, you don’t need to be in the dialout group if you try to access the port (file) as root of course.
I agree on the SerialDBG thing–it’s irrelevant for me. I will just use SerialUSB. As for your code not working with this (newer) library, I can’t explain that. Serial2 works great for me with the new library, and the updated pin-outs. I can’t recall though whether or not I put a logic analyzer on Serial2 to check for the same framing errors I have seen on Serial1, so I’ll need to re-check that when I’m in the lab again a bit later on today. I think I checked that port, but I can’t recall now for certain.
TB