Hmm thats weird... Does the webgl option stay ticked when you close and reopen the settings? If not can you try if the cfg_key ship_display_webgl is present in the kb3_config table and if not just create it and set its cfg_value to 1?
I added it to the top post but unfortunately when using a git repository the path is generated from the repo name and version e.g. master there is not much i can do about this.
Looking at that Naglfar kill you posted I found one minor cosmetic issue. Dreads and Marauders with bastion or Siege Module fitted will enter and exit Siege mode at random intervals, for Dreads the Animation sometimes does not move the turrets as supposed to. Seems to be some race condition when loading the ship takes too long.