I would beleive this is specific to just you in this case.
If I am not mistaken did you not recently switch integrations from on forum type to another in photopost. I beleive I helped you get things switched right and then told you if you imported from another forum type you would most likely need to create a script to reindex the photos to make sure they belong to the proper users. I also believe I gave you a link to such a script that I wrote for vbulletin when users switch to that forum from other forums.
Reassign userid's when switching integrations to VBulletin
I help many people so I do not remember every last issue but I am pretty sure I remember you did switch integrations recently.