Since version 21 was a major shift in Zoom Player's user interface, it required several releases in succession to squash out some edge case bugs.

I believe that with the release of v21.4, most of the edge cases have been dealt with. Now is the final opportunity to test the v21.4 installers before the official announcement next Monday.

Let me know if If you discover any issues, I want this release to be as solid as possible so I can begin work on version 22 in full force:
https://www.reddit.com/r/ZoomPlayer

Download Zoom Player MAX v21.4 :
https://www.inmatrix.com/download/zp2140max.exe

Download Zoom Player IPTV v21.4 :
https://www.inmatrix.com/download/zp2140iptv.exe

What's new in version 21.4 :

  * New Setting (Adv. Options / Playback / Media Server) that determines
    whether to list collections alongside categories in the Media Server
    Browser (PLEX / Emby / Jellyfin).
  * New Setting (Adv. Options / Playback / Media Server) that determines
    whether to list collections within categories in the Media Server
    Browser. This feature is limited to PLEX as it's the only media server
    that associates collections with a specific category.
  * When creating a new category, the Media Server media library plugin will
    now list Emby/Jellyfin collections. Emby/Jellyfin collections are not
    locked to a specific type (e.g. movies/tv) so every collection is
    selectable, regardless of the category type you are creating. This feature
    can be disabled in the plugin's configuration page.
  * When creating a new category, the Media Server media library plugin will
    now list PLEX collections based on the category type you are creating.
    Unlike Emby/Jellyfin, PLEX locks collections to specific categories.
    This feature can be disabled in the plugin's configuration page.
  * The Media Server media library plugin now lists PLEX collections within
    categories. This feature can be disabled in the plugin's configuration page.
  + The IPTV Setup wizard has been enhanced for clarity and includes new
    Information, Skip and Quit buttons.
  + When using the media server browser interface, going up a folder now
    restores the exact position of the list prior to entering the folder
    (the list's top index is now saved along with the item's index).
  + The MP4 and Matroska (MKV) smart play profiles have been split in two.
    Each format now has two smart play profiles, one for local file playback
    and one for streaming, allowing you to pick different components depending
    on whether you're playing a local file or streaming from a media server.
  + The Media Server Browser's pop-up hint that appears when hovering items
    is now a lot less annoying. The hint will only show when hovering over
    items that don't have enough space to display and instantly hides when
    hovering over other items.
  + Emby/Jellyfin collections are no longer listed as a "Collections" folder,
    this has been replaced with the collection setting above.
  + Updated MediaInfo to the latest version.
  + Small quality of life enhancements throughout the UI.
  - When moving Zoom Player's window between monitors should no longer pause or
    snap the window back to the original monitor.
  - Zoom Player will no longer adjust the minimal window size based on your
    monitor's resolution as it broke some features. This does mean there can
    be some visual artifacts as the control overlay gradient backgrounds may
    overlap each other if the playback window is tiny.
  - Right-clicking a media library entry did not select the entry unless it
    was in a TV or Movie category.
  - Fixed a case where another Zoom Player window could appear between the
    main player window and the control overlay.
  - The Home Theater quick search feature was partially broken.
  - The quick search feature now works on with both media file/url or title
    in the play history Home Theater interface.
  - When using the YouTube IFRAME player with the Chromium engine it was
    possible that seeking ahead/back multiple times in a row in under 250ms
    would seek in place.
  - The trial version of Zoom Player MAX/IPTV no longer asks you to upgrade
    on first run.