Immediately following updating to R56.9, my Quicken no longer showed the "Quick Pay" button on any pre-existing account in the Bills & Income/Bills area.
When I tried to enter a Quick Pay transaction via the drop-down menu, Quicken required me to RE-ENABLE Quick Pay. Quicken then required me to RE-VERIFY Check Pay.
I also had to deactivate/reactivate my Amex CC account, as it wasn't downloading any transactions via One Step Update.
Who knows what else R56.9 has wraught - I'm afraid to look further.