Additionally, if I try to change some of the other user details on the profile page, the backend generates the following:
E_USER_ERROR: setPrefixedCookie: Can't set cookie(loginsession, 9lTOzkTO4EzN0EjOiM3clN2YBR3chxmIsISM5cjM5Y2NjRDOyYjZ3ImYxI2M0MzMkVmY4YWNiJzN4QGNmJDZkFWOkETYoNHJiojIoNXYIRmcvd3czFGciwiIt92YuEWakVWblx2bwh2YyVGcA9mZulmI6ISZtFmbyV2c1Jye), headers already sent! Output started in /homepages/34/path line 527.
Again, the data is being saved, but the profile page refuses to reload.