If you select the first blank effect track below the “send 2” you can see in the track inspector that this track is muted. Unmute this track, and then the lane track should be unmuted as well. The effect track could accidentally have become muted if you had selected it and then pressed the M key.
This is actually something I’ve been meaning to change in one of the next updates. The possibility to mute any track in the hierarchy dates back before the compact track layout mode was implemented. I’m going to change it so that it is only the lane track at the bottom of the chain that can be soloed and muted. This should avoid these types of confusions.