Is there some reason why Wifi Manager won't let me delete an SSID? I know I'm spelling it correctly; it let me delete it's 2.4 cousin, no problem.
EDIT: Doh! Nevermind. I was unknowingly connected to said wifi; I always thought a plugged-in ethernet cable took precedence over wifi; looks like both were up.
When I deleted that SSID via the cmd line, I lost connection 5 seconds after deleting it....Doh! (Lightbulb moment...) Rookie mistake.