I am running Version 1.18.7.2457 - set to NOT AUTO-UPDATE.
I am currently not having any problems, I had an old XBMC box and had all my DVDs and BRs ripped to .MKV files (x.264 with AC3 5.1 sound). I created all these files to be 1920x1024 (and used Handbrake to remove all the black bands (top & bottom) - I want my movies to fill the screen. Also they have PGS subtitles embedded into them.
Took me months to get them all the way I wanted
Now I am (in order to make space) using Handbrake to re-code them all as H.265 (HEVC) files. Takes a while per movie - but I want to free space (when movies go from 14+GB to 5+GB) this makes me happy. They are .M4V files which do not allow for embedding Subtitles - so I have to create an .SRT file with those. I have been working with @JuiceWSA (see my posting below).
I am running PMS on a Core i3-4370 CPU with 16GB RAM under latest Windows 10 Pro. Using the Intel video of the CPU. Streaming so far has not been an issue. Gonna try streaming 2 different movies to 2 different TVs soon and see how that goes. Both TVs are connected to my 5GHz WiFi.
bh