Hi Jay,
Same problem I had last fall after upgrading to Indigo 5.0.0b7. When starting up my sprinkler system for the first time this year, no matter what I try, all I get back from my EZF is "ack: all valves off" I have Factory reset the EZF (the 12 second version) and deleted the device from Indigo and checked all wiring. Re establish EZF as a device and define and sync. Edit device and change zone names and durations. Then I try to run front grass zone (or any zone) and nothing happens except that Indigo reports "Sprinklers - Front Grass" on (ack: all valves off).
Any suggestions?