re: posting photos, I have yet to find the paperclip, but at the bottom of the page is the quick reply box, just below that is a go advanced button. that brings up the reply box with Manage Attachments button which when clicked on a pop up box appears to select our photos. you have to pull the edge of the box way right though to see the Upload button... weird.
you have to reupload your avatars too, via the UserCP upper left. The option is in the list that then comes up on the left.