Virus/Logic Pro 7 - MIDI timing probs

[soundsource]

Hello,

Thankfully I found this forum, I'm new here so I hope one of you can help me out.

I'm currently using an Virus B with Logic Pro 7 on a Apple Powerbook G4. The Virus is connected via midi to an Audiophile Firewire interface which is in turn connected to the Powerbook via firewire.

Now, my problem is thus. If I create a sequence in Logic playing out the Virus, the sequence seems out of time with the rest of the project which also contains audio files. I can confirm the following

1 - Logic is sending out the clock to the Virus and the Virus is recieving this ok (the small c appears on the screen)
2 - The Virus BPM is set to the same as the BPM in Logic.

I am suspecting MIDI cable quality, however, I would like to be sure that this is not a known issue and there is no current workaround before I purchase a new cable.

Thanks in advance
David McGuinness