Gary,
you don't have the + and - keys in the upper left hand corner?
The mouse pointer isn't showing, but it was "on" the - sign.

This shot is from 2016.10.
And that's the way the Markers has always been.
I'm not running 12 on either of mys systems.
But help me get one thing straight.
If Synth Rack is docked at the top in the browser, we all have shortcut issues? Or not?
T