Had this happen to me last night.
Tried to set a series link for 'Russell Howards News' show on BBC HD. Select series link and nothing happened at all.
Eventually in frustration I selected to record one show, then it was happy to set the series link.
Very weird as I've not had this problem before (or maybe I have not noticed and assumed the series link had been set - i.e see my post about missing series links. Maybe the series link was never set in the first place and I just assumed it was?)
Hope the pending software update fixes this bug!
I can live with only 2 tuners for now, but bugs with requesting recordings arn't good as it doesn't matter how many tuners you have if it's never going to record what you requested