> Youtube screwed everything up. I can't [...] get any spoof to "full screen" anymore.

Two threads with users having the same problem, which could be solved:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=11582&forum=53
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=11518&forum=3