Potentially premature as I havent worked out if this is the cause. (But I like to make assumptions early on, then get corrected by everyone else!!)

As it could potentially be the sound card....

Right issue I have;

The mic once a vocal has been recorded into Cubase seems like it has a weird phasing effect, very odd and definately not right! the overall sound seems mangled

I have tried it with a valve Pre amp and a mackie XDR Preamp, and different channels on the desk.. all have the same effect.

When listening to it live it sounds fine through the Studio monitors, but the phasing effect seems very obvious once it is recorded on screen!

Now I would say it could be the sound card but when recording guitars in they dont seem to have this strange phasing effect!

Has anyone experienced a problem like this with a Mic like this?

I think it's highly unlikely to be the mic causing this. Have you tried swapping the mic for a different one & testing that?
I suspect you've got a routing issue either on the desk or in cubase that's either recording or playing back a slightly delayed version of the mic signal along with the wanted one.

If the sound is clean when monitored directly I very much doubt it's a mic problem and agree with Shez that it's likely a routing problem somewhere.

However, in another thread just recently, somebody described a similar effect and it turned out to be that somebody had changed the bit depth on the recording down to 8 bits. I don't know if this can happen in Cubase but it's another thing to look at.

Bob