[Zubersoft]

You'll have to change the page turn mode to turn one page at a time. To do this, tap the center of the screen while viewing a score, and then tap the icon with a number inside a box. You can change that to "1" to turn one page at a time, and then you should be able to annotate the odd numbered pages on the primary/leader iPad.  Alternatively, you can add a touch action under Settings->Touch & Pedal Settings->Touch Actions to "Go Forward One Page" so that you can turn a single page at a time if needed, but the touch actions don't work while you are inside the annotations editor.

I am going to address this very soon though - I want to add code so that annotations created on either tablet in book mode are automatically synchronized over to the other device. I just haven't had time to work on it yet.

Mike