Hi Nick, thanks for your reply.
I think the overall common link to the pictures that crash Fotostation Classic is that Photo Mechanic has interacted with those files when they are on the CF camera card in the card reader. When I first bought PM, I did'nt know about ingest, and would download all the files from a CF card by dragging folders on the desktop, and then use PM to browse the files on my computer, and I also carried on captioning in Fotostation 4.5 for a while, (until I found that captions on TIFF files did not show up in either Photoshop 9 or Photo Mechanic). But the problem has happened with both applying colour class and with tagging the files in the check box on the bottom right of each file, using PM to directly select from the CF card. I am next going to try not using PM until after I have transferred files onto the computer.
My preferences is still set to write for JPEG, TIFF etc. to "Add both embedded IPTC and IPTC4XMP". Should I avoid writing IPTC4XMP?
Prefereces are also checked to Add IPTC-NAA Resource when embedding IPTC. What is IPTC-NAA Resource? Also if shooting raw how does one tell if XMP sidecar files are present and whether any IPTC4XMP is present?
Simon