From The Living Church we have this tidbit:
Priests are expected to use only authorized public liturgies when responding to the pastoral needs of gay and lesbian members, according to the Rt. Rev. Larry Benfield who said the shift became effective with his installation as Bishop of Arkansas last January. The policy shift was explained during a meeting of the clergy prior to diocesan convention last February and was a factor in the voluntary renunciation of vows by at least one priest recently.
If anyone knows more detail about this I would like to hear it–KSH.
Update: Some information about the previous situation may be found here.