Resurrecting this thread.
I just got my hands on an FCB1010 with the EurekaProm2 chip, flicked it straight into PA mode and was working happily with one directional MIDI. Ok so with that all good I then hooked up bi-directional MIDI and was looking forward to stomp-box effects state feedback and the like....and what I got was a flashing light show of intermittent stomp box statuses. The same behaviour as documented in this thread.
Seems to be worse for the delay stomp for some reason - it never syncs. The rest are almost tolerable, but they do flicker randomly.
Did anyone ever get to the bottom of this?