Disc rotor fouling brake post mount....

Hello folks
Building up a new frame (Orange Crush - parts swap from a P7). On fitting the rear wheel (Deore hub), I found that the brake disc (Shimano XT) fouls the post mount - not a lot but even not a lot isn't right!
This seems to mean that I need a deeper retaining nut for the cones on the non drive side (and vice versa) or an extra washer and a tighter fit for the wheel in the dropouts. This seems a bit odd though - I'd assume that the placement of the post mounts would always allow clearance for the discs as these are surely fixed standards. Is this just something that occasionally happens (and if so, how is it normally dealt with?) or is it a frame problem. I can't see that it is a problem with the wheel. The P7 used an adaptor on the rear and it worked perfectly well.
Advice appreciated!
Building up a new frame (Orange Crush - parts swap from a P7). On fitting the rear wheel (Deore hub), I found that the brake disc (Shimano XT) fouls the post mount - not a lot but even not a lot isn't right!
This seems to mean that I need a deeper retaining nut for the cones on the non drive side (and vice versa) or an extra washer and a tighter fit for the wheel in the dropouts. This seems a bit odd though - I'd assume that the placement of the post mounts would always allow clearance for the discs as these are surely fixed standards. Is this just something that occasionally happens (and if so, how is it normally dealt with?) or is it a frame problem. I can't see that it is a problem with the wheel. The P7 used an adaptor on the rear and it worked perfectly well.
Advice appreciated!
Faster than a tent.......
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iirc the spacers/washers are drive side and non drive side specific (different thickness to each other) and may have been fitted the wrong way around, I can vaguely remember having a similar issue.
Orange 5 AM Custom
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If its a post mount frame and an XT caliper there wont be an adaptor will there.
crush_frame-182 by http://www.flickr.com/people/[email protected]/, on Flickr
Looks post mount to me
http://www.orangebikes.co.uk/bikes/2011/crush/
And just to make sure I don't get them wrong again, rather than say what it isn't, I will say that the frame is as per the pic Stubs posted. I can post a pic of the actual frame when I get back to it in a couple of days but it probably isn't needed. On the pic, it is the upper of the two mounts which the disc rubs on.
The caliper is the sort with the separate spider.
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Post a pic of your bike showing the damage then we might be able to shed some light on the problem.
Tuesday hopefully for a pic but at the moment it might not show much - it's only scraped a sliver of paint off as I've only had the wheel briefly mounted with the frame on the stand. I could probably let it finish scraping the paint off but even then I'd worry at what might happen if the disc developed a slight warp. The clearance just seems stupidly non existent.
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Took the disc off - filed away at the disc mount on the hub to make sure no censored of flash was getting in the way. Filed away at the paint on the post and repolished it (thick powder coat so plenty of potential for thining it!) and then polished the slightly protruding heads of the rivets that hold the disc to the spider. Result below. Seems an almost improbably effective result but the answers speak for themselves.
Thanks for the input folks. I now need to wait for my decent BB cup tool and a new cassette lockring tool so replace the one I knackered trying to get this cassette off and I might almost be ready to finish the build!