Assignment

I have already posted about this in installation problems but not sure that that is the correct area. We have migrated our moodle to anew server, all users and courses appear to be working correctly. The marking block still shows the correct number of assignments to mark but when we try to view student files on the submission page or on the marking page the files do not show up. We have checked the file permissions on the new moodle data folder but this hasn't helped.
I will attach a couple of images to demonstrate this