I just updated to the new MusicCabinet Version 7 Beta on my Ubuntu 12.04 computer. The upgrade went very smoothly. It is worth noting, though, that In order to get it to work I had to uninstall OpenJDK 6. At first I had both OpenJDK 6 and OpenJDK 7 installed...
Media scanning went very smoothly. The only problem I noticed with it is that if an artist name starts with a character such as Ö they get filed in the # section...
I like most of the cleaning/re-arranging that was done, for example getting rid of the More tab.
One thing I absolutely do not like, though, is the new system for selecting random tracks. The problem is that once I select Random > By Track, there is no way to edit the list, or quickly add it to the "play" area at the bottom of the screen. Clicking the buttons for either Enqueue or Add Last is not a very good work-around as that each time I click I am prompted to send the track to my external player (Songbird). Under the old system I would setup the number of random tracks I wanted and they were automatically added to the play area at the bottom. I could then remove the tracks I did not want to hear, add more tracks, etc., then click Play. This would then send the whole set to Songbird...
Another HUGE problem I have is that I am no longer able to use Songbird (I have not tested any other external players yet)... When I try, instead of the set of tracks in the "play" area being sent, I get one of the tracks sent as many times as the total number of tracks in the "playlist". If I have 20 tracks selected I get one of them sent to Songbird 20 times!
The only other thing I don't like is that when I set the view to "Playing" the artist/album displayed no longer updates automatically to keep up with what is actually playing. I have to click the Playing button in the main toolbar everytime I want to refresh the view to the current track being played. This is very annoying...
I REALLY love what you are doing with MusicCabinet, though, and am sure that over time these minor problems will get worked out. Even with them I am still convinced that it (MusicCabinet) is the BEST friend Subsonic ever had!