Ive also noticed that from the last beta to this beta, dreamcast games are now completely not working, whilst before games such as REZ, mr driller, headhunter and sonic adventure 2 would play more or less fine, now they instantly boot back to ES when selected. It would seem that for now Reicast doesn't support the N2 or something is interfering.
----- Edit ----- Retested using 21st Build and Dreamcast is functioning as expected, mustve just been disabled features in the 19th build -------
I'd also to mention issues with the Sega CD as well, whilst i dont have many games to hand to test for this system, i have experienced both snatcher and star wars chess getting booted back to ES shortly after the splash screen with the sega logo and respective sonic sprite.
----- Edit ----- Retested both games in 21st Build and same results occur neither game will load past sega cd splash screens