Does the render dianostic come up with any errors ?
I haven't run into that myslef with cloth . But for some reason I added a wrap deformer to a surface and the surface threw its rendernode so it won't render out . I had to duplicate and export the copy to a new scene for it to render again . Have no idea why , but run a Render Dio and see if the cloth object is still linked to a render node .
Who knows , maybe its the same problem .
"...If I don't always like what I've made ,well,thats life for you .."
--Kit SummersIsle