Guys, the problem came back. Again deleted the plugin jails (everything) and reinstalled it a couple of times and got it running (for now). To be clear, at the moment
I'm only using the GUI in Freenas and I had PLEX running for 5 months, without having any problems. But after updating my hardware (new computer) and Freenas the problems started.
The install works perfectly. But after installing PLEX it sometimes can't find it's storage (mounted and all), the IP address can't be changed (even if you lock it in your router and set it in Freenas to DHCP...) and/or the web interface can't be reached. This happens most of the time after trying to change the IP (router says it exists, other computers can see the media server, but you can't reach it through the web interface) and after changing the settings in the web interface.
In the PLEX web interface it says that there is an update and that I should install it manually. But as you can guess, there isn't an update button. So I've been looking at the posts on this forum and tried updating it through the shell (post by Cosmo_Kramer; see below). But alas it doesn’t work for me. The shell is new to me….
Upgrading Plex:
When new releases of Plex come out, you may update without losing your data and preferences. To check if a new release of Plex is available via ports, visit this page:
http://www.freshports.org/multimedia/plexmediaserver/
To upgrade Plex, first install a tool called portupgrade with this command:
cd /usr/ports/ports-mgmt/portupgrade/ && make install clean
When configuration dialog boxes appear, accept the defaults.
Next, you have to update the FreeBSD port tree with this command:
portsnap fetch update
Then to upgrade all ports at once, use the following:
portupgrade -a
Alternatively, you can have portupgrade prompt you before upgrading each port with this:
portupgrade -ai
Afterwards, your ports, including Plex, should be up to date.