Hi Michael,

> If you turn off the view controls panel under Options > View > "Show view controls"
> you should see that you won't get sent back to the desktop in full screen mode anymore.

Confirmed.
I had first thought that it was a OSX Spaces problem like the Sub windows (drawing frames) not being considered to belong to the Main window thus generating an out of focus.
I'd never suspected the control panel of these windows.
That also explains the seemingly random triggering happening afterwards.
When reactivated, the 3d pane won't trigger the sliding because the control panel was redrawn in the 3d pane.
But, when entering into one of the other drawing areas, the control panel appears in the original desktop space and triggers the sliding.
And it's doing that until all four drawing frames are updated.

Thanks,

Michel