I have Poser 5.  However, I imported the cylinder primitive, laid it on its side and then imported the hi res cloth and placed it above the cylinder.  In the cloth room, I selected New Simulation, set the drape to 10 with nothing selected in the additional cloth collision options.  Then I selected clothify and clicked on cloth Plane,  In the collide against tab, I selected the cylinder, then clicked on calculate simulation and everything worked fine.

You may have another problem (easily solved).

When was the last time you "cleaned" out your cache, temp files, cookies, registries etc and defraged. 

Your Poser software may be scattered all over your hard drive.  When that happens parts of Poser simply doesn't work.  Doing the above clears up about 95 percent of all problems---Jan