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Youtube on Plex
I am having issues with plex (I am using it on my tv with roku)
-it will not play You tube videos which I have plexed
-It shows that I have no servers that it can detect
-In my account, I have "No Players Found" message (up on the right hand side of the main page)
-It does not play flash videos also
Help 
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Please disable "Verbose" logging
When logs (server or client app) are requested for an investigation, please do NOT turn on "verbose" logging unless it is explicitly requested. Verbose logging makes things much more difficult in the majority of cases.
When logs (server or client app) are requested for an investigation, please do NOT turn on "verbose" logging unless it is explicitly requested. Verbose logging makes things much more difficult in the majority of cases.
Answers
If you are new, did you install Plex Media Server on a computer in your home network? Plex is a server/client software, so you have to install the server software on a computer in your home network to access from Plex channel on the roku. See the Plex support documents - https://support.plex.tv/hc/en-us
If you are not new and do have Plex Media Server(PMS) installed on a computer in your home network, are you using a Windows computer for your PMS? You must install PMS version 1.4.4 for Windows because a Windows update makes earlier versions crash and close. See https://forums.plex.tv/discussion/comment/1398684/#Comment_1398684
Many issues and questions can be resolved by reviewing the Plex Support Documentation
Providing details about your issue, Plex setup, and including log files are important when when asking for help on the forums.
See Log Files
Before posting channel plugin questions or issues, please review the pinned threads at the top of the Channel Plugin forum:
READ FIRST: Guidelines for Posting Channel Plugin Issues/Questions and Things to Check First
FAQ for Channel Plugin FAQ