I am running on my site PhotoPost (7.03) and SMF2 (as my forum), with registration handled by SMF.
I set all the paid and free accounts I need in SMF, and than through Admin panel refreshed the usergroups in PhotoPost. The accounts showed up as expected. Then I set the permissions (disk space & maximum file size) for each account and gave it a try. Regardless of what account (usergroup) my members signed up for, in PhotoPost under "Upload Photos" screen it always says "Disk space allowed on your account: Unlimited" and "No file size limit".
How can this be?