Many settings pages have very little error checking. You can easily alter a setting which will result in a non-functional system, and short of restoring the database from a backup, there is no way to undo your changes.
Edit settings for: MythWeb Session
Many media players are incapable of playing files that are streamed from
https servers. If you run MythWeb over https, you may ALSO want to create
a non-SSL installation and check this box, which will force all streaming
downloads to utilize http instead.