Thanks for your post and apologies to hear that the latest episode of Arrow isn't working for you.
This was raised up last week however I think the team thought the issue was it wasn't showing as available. Looking online today I can see episode 18 is available to view but when clicking Watch Now, I am getting a blank screen.
As I have been able to replicate this, I have sent an email over to the team for them to look into this further. Once I have any news from them, I shall be back in touch
Kath_F Forum Team
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