Well you can always test the last sdl1 version to check, sdl2 started in 0.92, so the last sdl1 must be in 0.91.15. Also if you saw the post in the other thread, we became xp incompatible with 0.97.2, so it's probably because of the new function to detect the soundcard. It doesn't really matter anyway, xp is ancient now, and you are bound to hit an incompatibility like that if you keep adding new functions. Also something you probably didn't think about, but if you set Autodetect as default, then you will never see which card is selected, it probably doesn't matter much anyway as long as it can be heard, but if you want to have the detect and store result as before, the only way is not to have this autodetect as default. (or modify the interface to show which card was detected when Autodetect is selected, but I prefer to keep things as simple as possible).
And for the unexpected return of the black border : I had actually tested this in windows, but apparently this function doesn't return the same thing when you call it in windowed mode and fullscreen ! So it got me, because I didn't think about saving the config and run again. And it doesn't make much sense, it's supposed to be state-less normally... ! Anyway !