So, on the Avantis, the mute groups and DCA mutes will cause the mute led under the mute button on each channel strip to light up, rather than the mute button itself on each channel strip. Could it be the case that this is what is happening, and it’s not actually an error of the console but rather a simple oversight?
Also, keep in mind that once a channel has been muted by a mute group or a dca, you must unmute the entire mute group or dca in order to unmute an individual channel. This kind of threw me for a loop as I had been used to an M32, where I could unmute a single channel even while a mute group was actively muted. It took some getting used to, but it’s really not an inconvenience at all anymore, you just have to be a little bit more mindful of how you setup your groups.