I have a level that I am trying to port to the Samsung VR. Actors and textures that I want to spawn spawn correctly, but I have a simple HUD with a crosshair and text elements on it that does not display correctly. Specifically, the HUD only displays on the right eye, and it appears only a quarter of the way up the screen, as opposed to the direct middle. Any ideas?
turn off “mobile HDR” as a first guess in the project settings 
Mobile HDR was already unchecked.
Cross hairs will never show up directly in the middle because the middle exsists in the third dimension now. It will also be misplaced due to the offset of the human eye. You would need to create a dynamic cross hair if you want it to be accurate.
As for the rendering issues if it’s not the mobile HDR that is the issue then try hitting the console key (~) on a WiFi keyboard. I have no idea why but when I make new projects this occasionally happens and that fixes it.
Sorry for the double post bump but I found the issue in which you are running into with the stereo screens desyncing from each other. Under your “Project Settings > Engine > Input > Mobile” section clear the default touch interface so that it shows “None”. After starting a fresh project I run into the issues we have mentioned with the text not showing up in one eye and when I cleared the touch screen (the virtual joysticks they render on mobile devices) it cleared the issue up for me. Hope it helps.