I am seeing the same behavior with 3 of 4 Vizio TVs. The three that are failing (Plex loads, presents users, goes black after selecting user and entering PIN). The three that are failing are E-Series running Plex app v1.0.1 The 1 Vizio TV that is working is a D-Series running Plex app v1.1.0
The response remained the same after rolling back the Plex server to v1.18.8.2468.
Looking at the com.plex.app.system logs on the Plex server it has:
2020-03-20 01:38:44,473 (584) : DEBUG (networking:143) - Requesting ‘http://plex.tv/web/tv/vizio?X-Plex-No-Cache=1584682723333’
2020-03-20 01:38:45,529 (584) : CRITICAL (core:574) - Exception (most recent call last):
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\components\runtime.py”, line 843, in handle_request
result = f(**d)
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\System.bundle\Contents\Code\proxyservice.py”, line 49, in do_proxy
immediate = True
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\api\networkkit.py”, line 194, in Request
method=method,
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\api\networkkit.py”, line 67, in _http_request
req = self._core.networking.http_request(url, *args, **kwargs)
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\components\networking.py”, line 346, in http_request
return HTTPRequest(self._core, url, data, h, url_cache, encoding, errors, timeout, immediate, sleep, opener, follow_redirects, method)
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\components\networking.py”, line 118, in init
self.load()
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\components\networking.py”, line 160, in load
self._data = self._core.data.archiving.gzip_decompress(f.read())
File “C:\Program Files (x86)\Plex\Plex Media Server\Resources\Plug-ins-5d395aa9d\Framework.bundle\Contents\Resources\Versions\2\Python\Framework\components\data.py”, line 101, in gzip_decompress
ret = gzipper.read()
File “C:\Program Files (x86)\Plex\Plex Media Server\python27.zip\gzip.py”, line 261, in read
self._read(readsize)
File “C:\Program Files (x86)\Plex\Plex Media Server\python27.zip\gzip.py”, line 303, in _read
self._read_gzip_header()
File “C:\Program Files (x86)\Plex\Plex Media Server\python27.zip\gzip.py”, line 197, in _read_gzip_header
raise IOError, ‘Not a gzipped file’
IOError: Not a gzipped file