The rewind button behavior is normal — it does that by design (once rewinds to whatever frame you started playback at, then again rewinds to frame 1, etc.)
The animation stopping at frame 120 and then only play button active… sounds weird, but might be explainable. What emitter are you using? Do you have playback set to stop at the end frame or repeat (loop)? If it’s set to stop at the end frame, and the end frame is 120, and you have a complex emitter or scene, it can take a few seconds for all the particles to be calculated at frame 120.
I still don’t know about the “Manual” folder. Did you try copying it from the other computer (I forgot to view the “entire thread” so I can’t check back in your earlier posts).
Alan.
http://www.wondertouch.com