Chuck, All cookie settings are the same now in both phpbb and photopost as you said.
Something I found that was strange is that when I use different admin logins in phpbb then go to the photopost galleries, I am not always recognized as being logged in on photopost. However, if I check the "Log me on automatically each visit" in the phpbb forum, it always seems to work in both the phpbb and photopost. Is that normal?
Thanks for all your help