I upgraded to version 1.2.6.2975 and now none of my player work.

Hi all,
Help! I'm not a technical person, but have figured out how to use Plex Media Server running on a PC to stream movies wirelessly to my laptop, another PC, Roku box, and an LG smart TV. Everything worked for years but yesterday I upgraded the server to 1.2.6.2975 and now nothing works... The LG TV Media Player sees the server when searching but says no server available when trying to access. It will run the movies fine the the DLNA connection. I've discovered that if I sign into Plex on my PC it will connect, but I never had to sign in before on my home network. The Roku player just goes in circles.... I've tried reinstalling the server, but no change. I've tried to find the older server version to no avail... Help - and thanks!!!!