In addition to the mess that has become the most recent roku update, which a couple weeks in I can still say I am very unhappy with, I just noticed that marking episodes as watched or unwatched has a noticeable delay. I tested this on Roku Ultra, Ultra LT, Express and Streaming Stick, and the delay varies from 2 seconds to seven, per click.
This was not the case in the old functional app. Please return to that version.