MOL CP 3.3.900 / 901 PROBLEM!

[Chris T]

MOL has been working fine recently, but it just stopped working again. Here's my setup:

Mac Pro, OS 10.6.8
DP7.21
MIDI setup through Audio Midi Setup. Configuration has not changed.
MOL CP 3.3.900 (I tried updating the MAC vs to 901, but I think this is just for PC right? The updater is just called 900 when I downloaded it.... So I think I might have just installed the 900 ontop of itself... Anyway, it was working after I did that yesterday anyway).

2 PCs, Windows Visa
Plogue Bidule (running EW PLAY and Kontakt sounds)
MOL CP3.3.901

All setups are confirgured correctly, as they have been all along. Problem is, DP will not send MIDI data to the PCs (my other 2 PCs using trad MIDI interfaces are working fine).

The LIGHTS on the MIDI Monitor on the MAC are black (i.e. active) on the activated parts, although they don't light up (i.e. not sending MIDI signal).

The lights on the PCs are also black, but no lighting.

Please help!!...