I have the black now tv box and having same issues. Reset the now tv box and went through the setup procedure only for it to not work. AGAIN. please fix. I have to sign into channel 4 app every time I use it. Is this right? Never used to have to sign in so something has been updated on their side of things. What a joke.
Same problems here, although NowTV stick rather than box.
Regularly have to sign into the app, and often it decides that content (that we were already watching) is not available after an ad break.
Stopping and re-starting the show takes you back to the beginning, so "latest viewed" point is clearly not being updated.
As someone else has said earlier, though: the All 4 app is provided by Channel 4, not NowTV themselves.