I'm trying Pandora Radio on my Android app for the first time, today - mostly to test an issue that I had addressed in this thread.
I notice that Avenged Sevenfold Radio, Five Finger Death Punch Radio, Jimmy Reed Radio, and Thumbprint Radio (all stations that I recently listened to) are all missing from the My Collection list on the app. James Cotton Radio (with Avenged Sevenfold as a secondary seed), a station that I recently created for testing purposes, is appearing on the list, along with the following: Blues Magoos Radio, Blues Variety Radio (seeded with Sonny Boy Williamson I), Halloween Radio (seeded with Doyle), Rock Star City Life Radio (seeded with the Lenny Kravitz song of that name), Rock Variety Radio 1 (seeded with I Can Hear You Calling by April Wine), Rock Variety Radio 3 (seeded with Unto Us by Haven), and Scary Halloween Sounds (unconventional Pandora station). Blues Favourites Radio (seeded with Harpdog Brown and The Bloodhounds) also appears to be missing from the list.
When I initially did a search there for Avenged Sevenfold, it gave me a different station for Avenged Sevenfold Radio - which I soon after deleted. The missing station then briefly appeared - but have disappeared again, after the app crashing.
Just did another search for Avenged Sevenfold on the app, and gave me a different Avenged Sevenfold Radio. I'll listen to that one for awhile, and see what happens there.