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This is going to sound a bit silly, but I also dont have a file /xoops_data/caches/xoops_cache/adminmenu.php
However, in my supposedly redundant xoops_root/cache folder I did have adminmenu.php....
So I renamed /cache to /oldcache and renamed adminmenu.php to oldadminmenu.php
The admin panel still works, showing that my 2.3.1 installation isn't using the /cache folder or the adminmenu.php within it. This is as it should be, of course.
However, even after doing this I still don't have /xoops_data/caches/xoops_cache/adminmenu.php
What's going on?