The problem of "zombie nodes" hasn't been solved yet. Offline channels are still considered as capable of routing payments which in some cases cause the payment to fail because channels are unavailable. It is a matter of making a few changes to how channels signalize their state. More information can be found
here.
As I mentioned in my other thread, this problem has been addressed in the
v0.5 release of LND. I have just edited the topic and included proper explanation. I have also included a few questions which were answered by me in
this thread.