I, too, am getting the 404 error when clicking on a message on the message board. I added the code mentioned above to board.tmpl and noticed no change.
Is there another file that needs attention?
Running Photopost v.6 (9-19-07)
Is there a list of updated files since that build so that I can upload only those changed files?
PhotoPost Pro 8.23, Shared Host, Linux 2.6.27-grsec4, Apache 2.2.11, PHP 5.3, MySQL 5.1.85, GD 2.0.28,