I think we need more information to really grasp what you did/wanted to do. It is as simple as [Shift]+[Load] to unload a
fader. If the
cue is live when you do it, it might move the stack to another
fader so that the
stage doesn't go dark, but it's really not that complicated. [Shift] is strictly a modifier, meaning that if must be used in combination with another key to have any effect--placing it at the end of a command
line wouldn't do anything. Maybe you had something live on another
fader page or something so you got confused. Hard to say without seeing it.
-Tim