What model stb do you have?
Try rebooting STB.
Mine still has it.
I hit On Demand.
Then Select first Movie (Annabell).
I have option to Buy/Rent, Bookmark and Watch Trailer
tried rebooting stb. tried rebooting router. unhooked BOSE and DVD player and hooked straight from stb to tv. Still no option to bookmark in On Demand movies, only buy/rent or watch trailer. Ready to call Verizon - although I hate doing that and have them make me go through all the same steps I have already done.
Try hitting them up on twitter @verizonsupport