N6.5 No scroll bar on Mixer,can't access all tracks

In N6.5 when I call up the mixer window, I do not have a scroll bar at the bottom, I cannot scroll down the tracks to find the track I want to place an effect on the input. I cannot even see the name field of the tracks. Also in the list of tracks (i.e. channel selector) I cannot scroll down past the tracks that are already shown. (see attached picture)

I cannot see any way to change the settings of the mixer window so I can get scroll bars, or see all the channels.

FYI It works fine in N6.0

Thanks,
Brain
N6_5 Mixer.gif

Hi,

Open Zones tab, and make sure, all of your Channels are not in the Left or Right zone, please. Disable all zones.

The window seems to be cut. Can you resize it?