Hardware Issue??

[synthfiend]

Hi
I recently bought an Octatrack and have started using it to sequence the virus. I initially started in Single mode and all works smoothly. I'm on version 5.0.8.0.0

In the last few weeks I have started using Multimode as the Octatrack has 8 midi channels. Things started off ok, I could have three parts being sequenced on three channels. Now over the last week, it does matter what I do, when I go to Multimode it doesn't matter what Part I'm on it play the same sound. And in fact the sound does not change when I change the patch for the part.

I've checked the midi channel for each part, they all have there corresponding midi channels. I tried going into SEQ mode and it seems to behave strangely as well.

I actually dumped using the plugin on my Mac and moved to external sequencing on the Octatrack because things used to go completely awry in logic or ableton. But now I'm wondering whether I actually have some hardware issue.
Thanks