This issue is related to the rtMedia for WordPress, BuddyPress and bbPress plugin version 3.7
Right now I am altering the accepted protocols array with a filter called ‘kses_allowed_protocols’. One of my custom protocols is returning an empty string when using the esc_url function. When I disable this plugin, the protocols work and the string is not empty.
Whereabouts in the plugin does it interfere with the protocols filter or the esc_url function?
I don’t necessarily need a solution but if you point me in the right direction that would be helpful.