Do you need the whole simulation or only the last (or another specific single step? I always write out the cloth as an object file, apply the final pose to the first step, read back in the obj and delete the simulation. Alternatively you can spawn the last step as a morph and apply that to the cloth in step 1.
I got in the habit of doing that because when I save a scene with dynamic simulation (with P7) it forgets the whole simulation. I dont know if anyone else has this bug, maybe a Mac specific.
I dont do any other animations except cloth so I dont know how to solve your problem 'properly', but creating morphs has other advantages, like being able to continue a new simulation from the last step of the previous simulation.
( If this isnt clear but might be useful, ask I'll elaborate)
Good luck
PS quite often a hi-res plane from Poser isnt realy hi-res enough, unless you are simulating a handkerchief:)

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