Odd I know bland because we have tons of spice and flavor down south here at home, and never have found it bland just tastes like a lobster roll I have had anywhere else on property and on travels elsewhere in the US.
It changed off the menu sometime mid year so yes it would have been after February most likely. If you look on MDE the lobster roll is not listed (and has not been for months now) and when you go eat there it is not on the menus either on the wall or on the card they give you to look at while in line when we went a few weeks ago. But they still serve it if you know to ask.
Sorry you did not like it because me and DH always have enjoyed it at CHH.