I saw a lot of discussion on this topic and no clear fix (and many seem to be in older versions of Moodle).
We run Moodle 3.4 with Windows Server 2012R2. We run 64-bit, MariaDB, and have Unoconv 7 and LibreOffice 5 installed.
Before the upgrade from 3.3 the marking screen would load but the document remained blank. I *hoped* an upgrade to 3.4 would correct this, but no luck. I have read the docs page over and over. What am I possibly missing?
Thank you - beating my head on concrete would be less painful...