I've just installed RasPlex on a Pi2 1Gb (so it's the latest version 1.8.0)
I've used plex server on a local Linux box for some years (that too is up to date) and I have iOS clients and Amazon Firestick client. All working, no problems.
I find the Firestick client sometimes problematic. It's mostly fine but just occasionally it can't keep up with playback. There's a slight stutter before it carries on ok. Obviously this uses Wifi as there is no ethernet on this device. In the settings, the "Local Network" bandwidth is set to 20Mbps.
So I thought that I might fire up the old Raspberry (which has ethernet of course) on my gigabit LAN and put the whole bandwidth business to bed. However, once set up, i find all movies buffer immediately, play for a couple of seconds, buffer again, and so on. The setup is "Direct Play", but even when I set it as low as 1Mbps I get the same thing. The only way I can get anything to work smoothly is to turn on "Force Transcoding"...which, to my mind, kinda defeats the object of direct play.
So, if my Wifi firestick is working, is there anything obvious I should be looking at why my ethernet should not be?
(Of course, I can play these movies directly over the network on a PC just fine with, say, VLC).