I have uploaded 6 samples and PMed you the link. Also there is PMS.conf and debug.log in the same folder...
It looks like PS3MS doesn't invoke dcrawMS.exe after thumbnails rendering, perhaps it believes the file (DNG or CR2) is JPEG and passes rendering to PS3, which, of course, is not capable of processing raw files by itself...
I also noticed that it doesn't show transcoding engine name next to the raw photo file name (as it does for MKV for instance - it shows [MEncoder] next to the filename), if I am not mistaken, older versions (i.e. working versions) did show something next to DNG and CR2 filename to indicate rendering is done by external engine.
Win7 Ultimate x64 SP1
Intel Core 2 Quad Q9300
Thank you in advance for looking into it!