Did I forget to do prework prior to upgrading?...
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Starting plugin "Sonos 0.9.8" (pid 95248)
Started plugin "Sonos 0.9.8"
Sonos Your plugin version, v0.9.8, is current.
Sonos Loaded Sonos Favorites... [18]
Sonos Loaded Playlists... [9]
Sonos Loaded RadioTime Favorite Stations... [0]
Sonos Serving HTTP Streamer on 192.168.109.200 [0.0.0.0], port 8888
Sonos Loaded Pandora Stations... [68]
Sonos [Sun Jul 3 10:14:01 2016] Processed plugin preferences.
Sonos Error Error in plugin execution startup:
Traceback (most recent call last):
File "plugin.py", line 36, in startup
File "/Library/Application Support/Perceptive Automation/Indigo 6/Plugins/Sonos.indigoPlugin/Contents/Server Plugin/Sonos.py", line 260, in startup
File "./lib/twisted/internet/posixbase.py", line 387, in listenMulticast
File "./lib/twisted/internet/udp.py", line 175, in startListening
File "./lib/twisted/internet/udp.py", line 195, in _bindSocket
CannotListenError: Couldn't listen on any:1900: [Errno 48] Address already in use.