"Fixed a bug in the pattern detection code (DVDLowReadDiskID)"
That is likely what caused AND fixed the Disc Swap, as the issue involves the disc read process.
On another note, 2.9+ fixed the C_MTXLightPerspective bugs in WideScreen mode, which is cool because it fixes things like water graphics in emerald coast in Sonic Adventure DX: Director's Cut, and Dragon Roost Cavern's advanced heating effects in The Legend of Zelda The Wind Waker. Really nice little patch there. Crediar. Thanks.
BTW, if anyone needs a link to DM 2.10 or DML 2.10 b/c the original links on the google code won't work, i can PM link you to my uploads on another host since crediar's host is s***ing the bed today. If I share them, don't spread them around though. I don't want to get on Crediar's bad side. xD