Oh crud, sorry about your boss glitch. The character is scripted to move to a certain spot below and left of the boss to set up for the animation. I’ll fix this glitch in the next update but for now make sure you’re below and left of the boss when you right click and it should work fine.
As for alt tab bugs, I never tried alt tabbing out of my game and back into it before. So I’ll take a look and see if I can fix those issues. Thanks for letting me know about them.