It's still there, just may not be available in your desired class of service - look at Monday 3/12, there is award space on both LX JFK-ZRH flights.

An overall note with the award engine - if there is no availability in any cabin for a flight, it won't show that flight to even let you know that the space is not available!

One thing I do not understand though is that now there appears to be Standard awards (formerly called "EasyPass" with CO) for *A flights (look at Monday's LX flights for example). This I don't understand, it books into the same fare class as the Saver level. The cynic in me thinks that it's UA trying to trick someone into (for some reason) buying at the higher level.