I noticed in both your logs that Plex Tuner Service showed this error:
Jun 06, 2017 16:59:34.214 [13600] INFO - * web_server_t::start. Starting web server on port 32600
Jun 06, 2017 16:59:34.218 [13600] WARN - [E] web_server_t: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted
Jun 06, 2017 16:59:34.218 [13600] WARN - [E] web_server_t: port 32600 is not available
Which would make me think there’s multiple copies of Plex Tuner Service running…
So this is what I suggest:
Stop Plex Media Server entirely. Verify there’s no ‘Plex’ processes in Task Manager.
Go through your system and make sure nothing could have taken the capture output. Maybe Sound Settings? TeamViewer? Any application like this.
Then start up Plex Media Server again.
Now can you scan?