Plex won't start properly on DSM 6.1b. As usual, there are Plex-related issues when DSM is updated. Anyway, here's a workaround:
1. Enable SSH and login using putty, use your admin-account.
2. Type sudo -su root and enter your admin password again
3. Type cd "/var/packages/Plex Media Server/scripts"
4. Type ./start-stop-status start
You need to do this everytime you reboot your NAS aswell. It really sucks but it works..
