Yeah I have gone from previous save points and restarted the mission entirely but to no avail... And the only mod that was installed was the 'community based add-on' mod but I don't think that would have any effect, I removed it and I'll retry it now. My next step I guess is re-downloading the entire thing and start from the very beginning of the campaign?

It does work now, it seems the patch fixed it. Thanks for all your help!

Yeah I'll check as soon as possible, I was out of town for a few days but I'll check if it still persists later.

Oh I forgot, one of the instances in which I retried the mission one of the others survived and he went correctly to the Rendezvous point however the leader still went off course but the mission wouldn't continue without him.

Actually I just tried to continue my save and it told me the save could not be loaded due to an incompatible version. So I had to restart the mission and I'll post again on my results.