Let me start by saying that I saw the other person with a similar problem, but their issue was with the music library and that is not something I have enabled.
My setup is probably not the norm, but I have set up my htpc to run openelec. I use an addon called Plex Media Server by escalade and hugepants on my htpc which is my plex server. I did this because I like using plex and its web interface to manage metadata for specific movies and tv shows, but I let kodi handle all of my other movies and tv shows. Both the plex managed and kodi managed files are on the same hard drive. I was using plexbmc and the amber skin to watch those specific files via kodi, but I like the idea of using any skin I want and having the plex media visible without a special option.
Today I installed PlexKodiConnect and selected Addon paths. I'm not sure if this was the correct choice given that kodi and plex are on the same machine and not communicating over the network, this might be the source of my issues. The Plex media intergrated into the kodi library perfectly, however, the movies and tv shows that were already in the kodi library rescan every 30 seconds or so and I am unsure why.
I also wanted to ask if there was an easier way to set up everything. Seeing how everything is on the same pc, It seems like there should a different way to configure PlexKodiConnect to access those files directly, instead of going through the server and sending it back to kodi. I'm an amateur at this stuff, so I really appreciate any help anyone could send my way!