I have a course backup 467 MB from a Moodle 1.9.16. It restores to a server running 1.9.10. It does not restore to another server running 1.9.16.
After selecting the .zip from the backup directory, the last screen shown is "you are about to start the process for..." Click OK and the Moodle header updates, and the browser activity continues for 90 second and then a blank screen.
I turned on debug but there are no messages. In the php.ini, max execution time is 300 and memory limit is 18M.
What should I look at next?