When you say "Swithcing over to PAL" how exactly do you mean? I selected PAL from early startup and boot from floppy no workee
Hold down both mouse buttons to go to Early Startup Control. Display Options, Set Display Type: PAL.
I left Chip Type at Best Available and this allowed me to run the software fine. An dno, it does not hold PAL mode, which means everytime you want to run the software, you'll need to switch it to PAL from the ESC.
And to assist in eventually debugging the NTSC issue, I should note that the problem seems to be reproducible in WinUAE as well.