Thanks for the information. In fact I have discovered what the problem was - 84 of my styles on the external card would not load (Disk Error) from that card and this was the apparent limitation when trying to transfer them to the Internal memory. I have overcome this (tediously) by loading the 84 to a floppy disk (from which they did work OK) and then save to internal via the Style Composer menu. I don't fully understand this but it must have something to do with the database operation on file transfer.
Keith