Have had the same problems, and never could solve them.
Booting from DOS can be a problem too because the sim does not fit on one flop and my harddisk is NTFS which is not supported by DOS. Also the monitor signal (resolutions above 640x480) that is put out is not recognized by the TFT monitor.
Using AFP now.
Groeten,
Hans
Hans Meij / Modelvliegen