I'm only getting the 2x fast forward too. Just hooked up the alpine last night and played 2 mkv videos. I couldn't get more than 2x FF which makes it very difficult to resume a long movie if you're past the halfway mark. The remote is really bad (too tiny) and I on 1 MKV video the box booted me out of the movie back to main menu half way through and since I can only FF at 2x I switched to watching something else. The videos are confirmed working with my other media players.
I saw that the Alpine is supposed to work with the original PBO so I uploaded that remote software to my harmony but it doesn't work. I manually programmed the harmony remote but it only "sorta" works. You have to double or triple press the directional buttons to get any response. All other buttons seem to function normally.
Also with 500MHz processor I'm assuming flash support isn't happening? I was hoping to crossload netflix. I love android in general but am a bit disappointed so far. I was hoping for a media player that could do everything well. I'll wait for a couple firmware updates before I give up though.