When I log in directly to Moodle Snapshot 14/15 and go to the myfeedback report any access errors on the snapshots (such as users not existing, or not having rights to view them) causes a redirecting issue, where it sends the logged in user back to live. The report has saved the archive year, so it then tried to redirect me to the archive version of Moodle, which redirects me to live - causing a redirect loop.

You might get a user access error if you didn't have permission to see that student in that year, or that student didn't exist because perhaps they are a first year student.

This redirect issue probably explains why I get redirected to current when I try to select 2014/15 from the 'Academic Years' on the live version of Moodle
moodle/report/myfeedback/index.php?userid=99603&archive=yes&currenttab=overview