Those that have problems can help to pinpoint these errors.
It may help if those that ran into problems, state :
Which ROM version they tested.
Which EXT ROM version they have.
What programs installed on SD.
Did they reformatted their SD card to fat or fat16 or fat32.
Were programs re-install from scratch, or was any backup/restore program used?
Did they upgrade with newest ROM & updates first?
Lets hope that info would help..