K-1 Box 13 Code C still under development?

Since Schedule K-1 finally became available, it is saying that Schedule K-1 Box 13 Code C is currently under development.  It was originally supposed to be available last week and then was changed to "by March 6th."  It is March 7th and it still indicates the March 6th date (I'm using the online version).  This is the only thing preventing me from filing and I'm beyond frustrated.  When will this be available?