2000x1600@ 200PPI (original render)

What's it doing that you don't like?

All that black crap thats not there prior to rendering?

I'm not sure what "black crap" you are referring to but a lot of cyclorama textures don't display all of the detail until it's rendered. What I would suggest is doing a fast render without the figure just to see what the cyclorama looks like. Not a perfect solution but the only one that comes to mind.

What lights are you using? Is it IBL with AO, ray-traced or shadow mapped? I think it may be a problem with shadow min bias and the curved surface of the cyclorama. Try lowering or raising the Shadow Min Bias of the shadow casting lights in the properties panel. If it's IBL with AO, try lowering the Max Distance in the AO light's Scene AO Options, from the properties panel.
As a last resort, try unchecking Visible In Raytracing in the cyclorama's properties panel. That may work too.

I can't pick out the problem you're talking about, maybe if you marked it in your pic.

One specific problem I've noticed is that when using AO with that item (DAZ cyclorama) and Smooth Polygons, is that the AO shading is applied very incorrectly and leaves dark/black lines at the polygon edges.  I disable "Smooth Polygons" for just the cyclorama in those cases.

I forgot that smooth polys may also cause this.

Thanks for the idea's Raven, I have one other render running atm then will try a couple of your idea's to see what happens.

and yes that is the black crap I am talking about, thanks.

Yes that would be the smooth polygons causing the issue thanks!