When fitting my juicy fives to my spare forks, manitou black's, the cup/dome washers were fouling the disc(which I got around by using conventional washers and luckily all is straight).
The new forks I wish to buy marzocchi mx comp are also post mount, does anyone use juicys with these forks and if so are/were there any clearance issues??

Please help.

I have MX Pro forks set up with Juicy 7 and had no problem at all with clearance issues.

Sounds good.
Hoping it's just the manipoo's.

Got a similar problem with the lower outer cup washer when using the IS mount bracket on my RS Revelations!! EXTREMELY tight clearance!

Yes, that's the devil that is causing me the hassle.
I'm still having problems, and now cannot afford new forks till end july :-(

Are Marzocchi now using Post Mount then? Used to be reserved totally for Manipoo, worth knowing!

Yeah.
Why is post mount considered to be better than IS? Sure it is a bit stiffer, but one false move and the threads are stripped leaving your entire fork useless, whereas with IS you can just get a new bracket, and also remove and replace caliper without having to re-centre, etc., not to mention that it is an international standard and thus is supposed to make life simpler and more compatible.
(And yes, I do realise that you can break the IS holes, but it's not as likely.)