Thanks for that. I'd wondered why some servers worked and others didn't - I didn't know about the acceptpathinfo setting in Apache.
Another way to fix the problem (if you are willing to make it a little less likely browsers would cache the content) is to flip the "slasharguments" setting in Moodle's admin settings.
Cheers,
Martin
Installing and upgrading help
Moodle, Apache 2.0 and RedHat 8.0
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