I noticed a bug, in that if you close the window, you can't get it back unless you quit and relaunch AO. If you close it and attempt to use the open command, it will unexpectedly quit.
Also, if you close it while playing the included "Tetris 2.ay", it will display a strange graphical glitch, then unexpectedly quit.
I especially like the ability to close that window, though. You couldn't do that in the old version of AO.
I am using an MDD PowerMac G4, Dual 1.25 GHz, 1280 MB RAM, if that should make any difference.
I have one additional comment that you may or may not like. When playing multi-track music, you can press right and left to switch tracks just like in the old AO. I really like this.
I think maybe it would be a good idea, and maybe it wouldn't be too hard to implement, if when you reached the last track of a file, and pressed right again, that it would continue onto the next file in the list. This would make it operate much like iTunes.