828 MKIII - SYSEX editor problem

[bornis]

Hello all.

I'm using the 828 MKIII MIDI connection to my:
Roland XP-80, Synth workstation
Roland GP-100, Guitarprocessor
Behringer FCB1010, MIDI foot controller

I have tried patch editors with all equipment listed above (using sysex).
And they all download 3-6 patches and then it stops.

Is there a hardware, firmware or driver problem with 828 MKIII's MIDI-interface and SysEX?

MIDI data to/from cubase or sonar is OK.
I have't tried any other MIDI intereface yet.

Regards
Bornis