Rumor was someone reported this drama which caused it to get pulled off at the last minute. A NEF fan blogger wrote a good description of what's happened:
" Giving a more comprehensive answer since everyone's curious (but the short answer is that no one - including industry insiders - really knows what's going on):
1) The unofficial word is that Zhejiang TV is giving it one week - they will continue to air Keep Running reruns this week as Linmon (with the help of Youku, Tencent, and possibly ZJTV) scrambles to get the green light to air again. This is mostly due to 1) ZJTV spent a lot purchasing broadcasting rights for NEF, 2) it's supposed to be one of their headliner dramas this year, and 3) they don't have a backup new drama that can immediately take the slot as they need time to get a broadcasting license as well.
2) What happens in a week then? If NEF still can't get cleared, then that's it - ZJTV will air a new drama, and it'll be pretty much confirmed that NEF won't be airing on TV this year, as ZJTV has the rest of its lineup for the year already set. And the second half/third of the year will be all dramas dedicated to the 70th anniversary of the PRC.
3) You might ask then, what about just an online broadcast then through Youku and Tencent? It depends on the severity of the issue, since technically webdramas and TV dramas are supposed to be held to the same standards now, but Youku just dropped another teaser yesterday, so it seems like they're saying "we're good to go". However, this is a problem for later - Linmon's short term goals will be focused primarily on getting a TV broadcast.
4) As for why the drama got pulled - no one knows. Everyone - the production team, industry insiders, cast, etc. - were blindsided. Jiang Nan confirmed yesterday that he doesn't know why either.
The rumor out there is that someone reported NEF to NRTA in the eleventh hour. It wasn't initiated by NRTA because they already issued the broadcasting license and would've been inactive that late at night, but if a third party raises an alarm that they think there might be inappropriate (read: sensitive) content in the drama, NRTA is forced to retract and re-examine (this is supposedly what happened to Hunan TV's Investiture of the Gods too - though in their case Hunan TV just axed it since it was already airing).
That's why the solution won't be as easy as "edit stuff out" either - there are a lot of moving parts here in a constantly changing political environment.
The NEF production team did everything right, they obtained the right licenses and followed all the proper processes. But the rules changed on them last minute, and while it is immensely unfair, they aren't the first (though this close to premiere is unprecedented), and they won't be the last, unfortunately.
Industry journalists don't seem very optimistic at this stage that things can be resolved in a week, but I guess we'll just have to see."