I'm in too deep, there's no turning back on this game now!
With the sound, is it in the main menu music as well or just the in-game? Does turning off the Ambient track in Sound Options clear it up? Because after getting some newer speakers I can now tell the ambient track sounds really terrible and is definitely in line for replacement.
I'll have to play around with alt-tabbing to make sure it captures the mouse properly, I must've missed a case in the capture check somewhere. Break the move speed how? Like it accelerates you a bunch if you tab out and then back in?