I did the 2.4 update also, installed jukebox but haven't scraped my movies though as it will take a lot of time and would probably scrape it manually.
Can't comment on the HDMI issue with an AMP as I am using HDMI direct to TV and it works fine.
Issues that I found (or probably not an issue at all)
On v2.3.1 my anime series plays one after the other but with 2.4 it will stop the current episode then I'll have to press play on the next which I find a hassle. Seems that the play button doesn't work, have to press the enter button to play a video.
I'm not sure if Xtreamer is capable of autoresizing the video to full screen as some of the older episodes of my anime series is 4:3 while the newer ones are 16:9. I have put my settings to 16:9 but that doesn't take effect on the 4:3 videos.