Been having no issues myself since todays title update, but many people are. Theres been a few posts in the Media boards about this,as well as Sky's new Sky Go forum:
Could always try deleting the Title Update from System Settings \ Memory \ Games \ Sky Player \ Title Update and re-downloading it and trying again.
KK cheers mate I've had xbox live for just over 2 years now and every update microsoft do they seem to stuff it up. Oh well I'd take an xbox 360 over a playstation 3 anyday. At least xbox hasn't been hacked for 2 months yet
It now has the play option (thanks to Lewgiffard for the tip) but when I press play it says a licence cannot be given. I'll say it again just incase, it's not my subscription because I can watch all the live channels fine