Hello,
I've enabled xhprof in PHP and can see the menu options in moodle after restarting Apache. I've configured it the same as working environments (enabling, selective profiling) and added the XHPROF_FLAGS_NO_BUILTINS flag to prevent segfaults. If I visit a page with ?PROFILEME I can see a message at the bottom of the page that the request has been profiled and in the access logs that the request includes the query but the run page is empty.
Any advice would be appreciated. I noticed in the xhprof files there's a default path if none is specified for run files. Can anyone confirm what it is so I can check that they're not on the filesystem and just not displaying in the front-end?