The administrator should have a "health-check" button in H5P Settings that goes through the most common PHP errors we know of (php extensions and settings) and points the administrator to a page where he can read how to fix the error. If we don't find an error he must be told to look in his php error log and browser console when reproducing the bug before potentially reporting this on the forums.
h5p core version
database + version
platform + version
A "troubleshoot" or "health-check" button must be added to settings so administrators easily can figure out what went wrong.