When playing back a TV show or movie pressing either Menu (M) or Info (D) jumps the playback forward 10 mins. I’m using the keyboard input mappings.
Is this a bug?
I can’t confirm.
I have just now successfully controlled HTPC from both Plex for Android mobile and Plexamp.
You need to make sure that
- you have a plex server in the same local network as your HTPC computer (it is needed to relay the remote control commands)
- the mobile phone is using the same local network (per WiFi)
HTPC is running on the same PC as the server and the phone is on the same network.
Plexamp can see the HTPC as a device to stream but times out and fails to connect with a could not connect to device error.
Like I say, this did work a while back when I last tried it and nothing has changed on the network since then.
I may be off mark here but my PMS handles HDR tone mapping (in settings under Transcoder).
I have a number of titles that get transcoded from HDR to SDR for our TV upstairs and all works well via PHTPC…
If I play an HDR file on an SDR display with PMP, tone mapping is turned on automatically.
With PHTPC I have to go into playback settings and choose a transcoded option manually to activate tone mapping.
Whether the server or client is doing the tone mapping, the issue is that the behavior when you push Play is different on different clients. Whatever their intent is, it should be consistent.
I have never needed to do that - happens automatically.
Edit - my PMS is hosted on a bargain basement Ryzen 2700X Win 10 machine, HDR tone mapping option enabled in PMS.
Weird. I have a Linux server but still, tone mapping has always worked automatically until I tried PHTPC. 
Well, could be worse.
Have just experienced this on playback of an HEVC file, subtitles off and video and audio set for direct stream. As you say a second or two and then plays. Video still not judder free but watchable. Interestingly (maybe) plex web and I got the your server is not powerfull enough to play this…
On Linux and FreeBSD systems using Intel GPUs for hardware acceleration, the “libOpenCL” library and “Beignet” GPU driver are required.
For others, more info on tone mapping here
Also, you need to meet some minimum specs for effective transcoding
I have that stuff installed and my Linux server can do tone mapping. The issue I noted is that tone mapping did not engage automatically in Plex HTPC, making the video look bad until I changed a playback setting manually. In PMP that was not required.
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I just ran another HDR movie on our 2nd bedroom screen (non HDR) - played perfect.
Tone mapping checked in PMS.
Automatically.
We established that you and I saw different behaviors.
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I know but it’s like an annoying itch that I can’t get to 
What are the specs of your PMS again ?
Synology 920+ running DSM 7. Wasn’t an upgrade either as it was new. 4 8TB drives running as RAID 5
DS920+ | Synology Inc.
Which is possibly why you struggle with transcoding certain media (note that subtitle transcoding with h265 can push things with lower cpu/gpu hardware)
But I’m not transcoding, everything set to direct play and subtitles turned off 
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plex web has problem yes, HTPC has the brief blue screen and then slightly juddery playback. VLC has no playback issues
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Sorry - missed that,
I direct stream but Plex still transcodes HEVC for me. Not sure why. Only on two TV’s that are older. That is why I mentioned transcoding.
I also have HW transcoding turned off as it caused video to stutter.
Edit - After latest PMS update, not seeing the blue screen flash. Could be coincidence. I think mine is an HDMI handshake issue as I’ve seen it on VLC
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You should really search this thread as I’ve spoken on both of these topics. The first is in Plex HTPC feedback - #708 by gbooker02 and the second is in several posts where I go into excruciating detail including workarounds and more permanent solutions.
