I have experienced the exact same issue reported by others - Once watched, an episode will not restart and there is no "restart from beginning" option like most other apps - I checked, "hidden" ... * ... and "all arrows" (these are the multiple ways to find the "restart" feature during playback on streaming apps) ... NOTHING!
The only why to restart an episode is to CATCH the VERY SHORT MOMENT during the credits. You must press rewind during the end credits ... if the auto play is on, you will a few milliseconds to move the cursor to the credit screen in the minimized window, that appears at the bottom right corner. Once the credits are full screen again you have milliseconds to press rewind before the end. In most cases, you will miss the 'rewind window' because, at this point, you are at the end of the credits. To use this process, you must have quick fingers ... SUCH A PAIN!!
I do not believe this is a PARAMOUNT issue!!! This extremely inconvenient problem does not occur with ANY OTHER APPLICATION that I use on Roku AND, I receive the same error NO MATTER WHICH DEVICE I use. I have restarted the devices and, uninstalled & reinstalled the app, too many times to count, but nothing helped. I have also contacted Paramount techinical service but I just keep getting the same standard response over and over and over again ... even from the escalation team. They ARE NOT LISTENING!!! They ask you to unstall/reinstall the app even when you tell them you've done it a 100 times ... they want you to check your internet connection (REALLY!! COME ON!!!) ... they tell you to clear your 'cache', even when you tell them you are using your televison!! I am so READY TO CANCEL MY SUBSCRIPTION!!!!