Perhaps it's just me being an idiot, but I'm having a hard time converting a Single-master to a Facing master page.
Mostly when it comes to setting margins, but the whole master behaves oddly when it was initially created as Single and later converted to Facing.
If I initially create the master as Facing I see no issues. But if I create it as Single I find I'm better off deleting it and starting all over if Facing was what I needed.
Anyone else seeing this? If I recall correctly, I've noticed this in earlier versions, as well.
To recreate:
Create a new master as Single.
Go back and edit and change to Facing. Try to set margins, page size, etc.