I am running PM 4.6.6 on macbook pro with snow leopard 10.6.7.
How can I update an IPTC field that I filled out wrong in all the photos at one time?
Select your photos.
Open the IPTC Stationery Pad from the Image menu.
Edit the field that you want to update.
Make sure all other fields are unchecked (each field has a check box preceding it that determines if it will be applied).
Click on the "Apply Stationery" button.
Done.
HTH,
-Kirk