My trigger has not worked on some of the firmware upgrades but worked fine for a while now. Until today. The Ultra was on and the VU meter was dancing to the music but the amp was not on. I rebooted the WiiM and it worked (the trigger was turning on the amp). But when I changed software (from Roon to JRiver) it went dead again (Ultra was on but trigger had the amp off). After I once again rebooted WiiM, the trigger worked again.
Frustrating. This is a recurring problem which sometimes gets fixed. Unfortuately, it's back. I sent support notes in the past.