There are a two different issues here:

• If you have a bar Enabled -> toggle bar lock on -> then disable the bar. It keeps the bar visible whether bar lock is toggled on or off.
• If you have a bar Disabled -> toggle bar lock on -> then enable the bar. You are unable to see it or change it's position without first toggling bar lock off and then back on again.

Wouldn't mind looking into this myself if that's not a problem.