Error 0E 08 with din/dout

[banneduser]

Hello Midiboxers,

I have a strange problem with the din/dout-modules:

if I connect the 2 din's - OK

if I connect the 2 dout's - OK

if I connect both  -  the sysex-message  

"0E 08 - wrong adress" appears sommetimes more,

some times less.

Did anyone had this problem ?

Thank you for reply.

(I did not have this problem last time i did the MB64 with the PIC 16F877, very strange)