Midi-Connection doesn't work on one of my 18F4620

[Pearl]

I have a very weird Pic18F4620 here:

 

It looks like pic can't establish a correct midi connection to my midi2usb board

- I have 3 core modules each with pic

- all 3 pics have the label 1109040 on top

- two of my pics are working correct on each socket and can establish a midi connection and I can upload mios applications

- for the third pic it doesn't matter which core I try, I can see hex sequence (f0 00 00 7e 40 00 01 f7) every 2 second

  -> but I can't upload anything

- for this Pic I get a valid connection in MIOS Studio only, if I'm using two different MBHP USB Ports which could not be correct (see picture: MidiOut should be at MIDIOUT2)

- it also doesn't matter on which MBHP USB port I'm connecting this Pic (both other pics are always working correct)

- I can use a Pic 18F452 too and it works correct

 

So, for me it looks like a hardware bug/failure...

Did anybody have the same behaviour anywhere?

Bye Stefan