Quick Fix: Element displays X over a fader

If an Element console shows an "X" over a fader it means that the fader is in use by another studio.

When an audio source is used by multiple faders or studios, the first fader to load the source will be the one that generates GPIO (like remote start) and special mixes (like feed to source or mix minus). 

A fader that shows "X" will still work to fade up audio.  You may share an audio source on as many faders or different studios as you wish.