Seems that NowTV are aware of it and are looking to fix it ASAP according to a related raised question over on their NowTV Twitter feed where it must be effecting certain devices.
I don't own the old white box anymore, but i am guessing you have gone directly to the Sky One channel folder section rather than typing Cobra in the box search engine to find this TV show ?
Over on NowTV Twitter they mentioned going to the NowTV website and selecting the show from there by adding it to your My TV Watch List, but according to one Twitter reply the show did get added to their Watchlist on their box, but when they then tried to watch it back on their box it flagged up an error 1300 code.
Hi NJ & Schnapps
I've binged watched all of the six episodes of Cobra last Saturday night/Sunday morning and I thoroughly enjoyed it, apart from the last half of the final episode.
(Final part of the above sentence can only be seen if highlighted)
Now, the problem with this program is that I could not find a thumbnail for it anywhere on the Now TV site. So, I had another light-bulb moment (Schnapps knows what I'm talking about) and while actually on the Now TV streaming channel I did a search, Cobra then popped up as being available.
Obviously something is wrong when a premièred program cannot be found, therefore something for Now TV's techies to look into.
PS. Personally, I don't think the invisibility of Cobra is a box problem because I searched Now TV's website using my PC and did a visual search only on the channel using my Roku 3, and in both cases Cobra was not there. Only when I used the channel's search facility did the program pop up, and only after I spelt out the entire word, because usually typing "C O" would have been enough to bring up this program's name.