SMF has two avatar types non local which means users upload a full url to an image and local meaning the ones in your SMF avatar directory. Whatever the file I posted works with both types. I am assuming your smf url in the photopost config is right here as it would need to be
cookies
You need to have SMF and photopost on the SAME DOMAIN as SMF does not have any true cookie settings and you need to have photopost set to cookie path of / and the smf cookie name has to be entered in Photopost cookie settings
So smf and photopost on
www.domain.com works
one on
www.domain.com and one on domain.com does not work