This is baffling me... I have a multisite with 13 sites in total. The multisite setup has been up for 1 and 1/2 months. Just a couple days ago 2 of the sites started to not display all the pictures in the media library and would not allow the users to upload new pictures either. One of the troubled sites has this mystery blank image that loads that I cannot delete and has no information attached to it. The other troubled site has a mystery blank image which I CAN delete (but have not deleted yet) that has the title "system-membership". I use the the "Membership Pro 2" plugin. I don't know if this issue is related to that plugin. Anyway, I need to figure this out as soon as possible as my users cannot contribute to their blog. Any ideas as to what is causing this?