Since you are having issues with Plex for Windows (1.6.3) you should try Plex Media Player (3.0) and the steps listed on this reply. Keep in mind that Plex for Windows is NOT the same as Plex Media Player. So Plex for Windows will not have the same options as the previously linked reply, you will have to install Plex Media Player to get the options mentioned.
Other users that have done this have told me that simply switching to Plex Media Player solved their issue. Other have had to perform the additional steps I have previously mentioned.
