Coffee Lake should be working OK.
1.32.5.7210 fixes hardware transcoding on Apollo Lake.
Gemini Lake will be fixed in a future release, date unknown. In the meantime, fall back to 1.32.1.6999 or try the engineering build mentioned earlier in the thread.
Subscribe to the Plex Media Server announcement thread. Scroll to the bottom of the thread, change Normal to Watching. You will be notified of updates, including beta releases. When a fix is available for Gemini Lake it should be in the release notes (as it is for Apollo Lake).
