My issue seems similar to other reports, but not quite same, and I have not found solution. The profile photo thumbnails (50x50) on the member directory module (i.e. main list) do not display. They do display correctly within all other modules, from what I can see, including the profile and the journal. I have set the permissions to allow everyone to view (see page http://assureme.co/tcfl-nkba/Members/MemberDirectory.aspx for example).
The image "src" is being rendered differently for the images that do not display versus those that do display. Namely, the form for the images that do not display is
/profilepic.ashx?photoUrl=/Portals/3/Users/003/03/3/profile.jpg&h=50&w=50 whereas it is
/profilepic.ashx?userId=3&h=32&w=32 for those that do display.
The member directory module DID properly display images in the DNN 6.2.4 version, but things broke after upgrading to 6.2.5.