The old version 1.40, finds my 360 and plays, but it doesn't have fast forward, and it stutters when I play .mkv files.
You won't be able to FF/RW when transcoding to the 360 regardless of the version of PMS. The only time FF/RW will work, is with native files
. It's a sad fact of the 360 and it's limited capabilities as a media renderer.
So, don't get too excited thinking a new version is going to change things, at least of the FF/RW end.