This is probably simple, but I haven't found the answer.
After working on a few individual tracks, I came back out of solo mode and noticed that the audio on one of my comp'ed tracks was gone. The clips show audio but the clip colors appear washed out a bit. I can copy/paste a clip from another track into this one and it plays fine, so I've rule a track issue out. It appears at some point I accidentally muted the individual clips themselves in the entire track, but I haven't found how to unmute them.
PC: ASUS 15.6" Republic of Gamers Strix GL553VE Notebook
Windows 10 Home - V10.0.16299
S1 22.214.171.124910 Win x64
Audio I/F: Line6 TonePort UX2 Driver v126.96.36.199