I have just tried with 1.35 B1, but the problem stays the same.
This is what I'm getting :
Connect to Port 1
Error: Check conn
Heading = 0
When debugging, it seems to float around line 112, which is:
If I disconnect the cable it says Read OK instead of Error.
I am not using a long cable, a normal 35cm cable.
Just to put a bit more "meat to the bone"