Just fixed the ET4000/W32i/p emulation to properly render the sprite again. It was using the old attribute controller output field overrides instead of the proper latched output it's supposed to use. This fixes the Windows mouse cursor to render properly when hardware accelerated again.

Managed to get Windows 3.1 booting into standard mode again. Hopefully no more crashes now.
Although I did experience a 'Stack error. System halted.' running edit.com inside MS-DOS 6.22 after typing a little bit?

Hmmm... Running the Pink Panther in Hocus Pocus causes the mouse to still respond, but Windows to hang?

Managed to fix faults and interrupts combined with the EXT bit. Now that should be handled correctly (instead of the EXT bit incorrectly affecting the interrupt processing itself).

CheckIt 3.0 still crashes during it's Interrupt Bug test, however (on a near RET to a 0000 MOV [BX+SI],AL followed by FFFF #UD). The near RET looks fine, but the stack seems weird or corrupted somehow.