[4.1-17.12.02][C64] GUI Button RESUME seems to reset emulator

When you want to change disk while playing multi-disk games, you have to open GUI and insert disk 2 o 3 etc ... Once you have insert the disk in DF8, you have to resume to the emulator and press key or button for continue. But the problem is that the RESUME button of the GUI seems to RESET the emulator. So you can't play any multi-disk at all like Epyx California Games, Winter Games etc..