MIDI dropping out

[Toby75]

MIDI keeps mysteriously dropping out. Sometimes it works and then other times, nothing. Have been adding some things recently (external hard drive, no installation necessary)
Went to Reason and deselected MIDI inputs there, still no good.
Once recently, I was loading up all my programs and changing parameters, and it crashed. A nice message came up saying to Restart. ANd then everything worked fine. Now it has dropped out again after I added a External Hard Drive.

[kreekry]

I've got the same probleme.The audio continue but the midi stop.....
Imy config :
PWBook G4 1,67/1,5 Go Ram
Pt 7.1.2
Mac Os 10.4.8

I have no other harware the Mbox2 pro is alone on the firewire bus.I'have only two application on this systeme : P-tools and Live.
It happen with P-tools but with all other application, because when it happen it doesn't work too with the mac osX midi config panel (you can't test it, the midi led of the M-box doesn't flash).
I have too relaunch P-ttols or live .
an Idea ?