That's probably due to the TCP/IP port consolidation work that was put into FM13
Interactive field content is streamed through port 16000 I believe and if that port is blocked then it would explain why it is not working for the remote users.
Interactive content for containers is usually for "big content" like multi-page PDFs and video/audio. Not sure you are getting much benefit for pictures.
Thanks for your quick answer!
I thought it might be a port issue, but then why would it work on the mac client and not on the windows client? In my case, port 16000 is open to be able to access the admin console from any site.
Well, the benefit I get by showing interactive content is that the size of the pdf generated from the student list or the size of the print job sent to network printer is really optimized (at least 7 to 8 times lighter) not to mention that the time needed to generate the pdf is much faster as well when showing interactive content instead of pictures.
I could also resize all the pictures, but the point was to have a high quality copy in the database and let FMS do the job. And as I said before, it was working fine in 12. and it's still working fine for local users...