A subscriber posted this on the support forum regarding Roku devices. If true, there are going to be some pissed off people, including me because this worked in pre-season and it was also functional the last several years prior. This is a real issue for those who can't get home in time, or simply want to rewind the game back a minute to see a play over again.
Per the issue of not being able to start a game in progress from the beginning, I just received this message from NHL.tv email support: "Unfortunately there is not the option to "start from beginning" on a ROKU device. There is the option of watching the game after 24 hours if you missed the game or 48 hours if the game was blacked out."