As far as my transparency issue in PP11, I've tried several tweaks and suggestions, but nothing worked.
That said, however, I deleted the dynamic dress from the scene I set up in PP11 yesterday, and added it a again, and THIS time it worked when I applied the texture directly from the Material Library. Needless to say, this is quirky, and may not happen all the time, but at least I know how to get past it in the future. Of course I'll need to re-sim the dress, but that's the least of my worries, since I made notes of the settings in the Cloth Room.