Server OS: Win 10 Pro (1809)
I switched to an XML guide from Schedules Direct a few days ago and got it working successfully. Updated to new release last night and refresh overnight did not work. A manual refresh from the DVR management page does work.
It seems like in the scheduled task there is an extra slash added to the beginning of the import file. I find this in the logs every couple of hours as it tries to refresh the guide:
Sep 25, 2019 13:03:19.869 [11888] ERROR - EPG[tv.plex.providers.epg.xmltv]: Failed to get creation time for file at path: /C:/epg123/output/epg123.xmltv