@mitu said in FYI: Retroachievements will improve more:

I expected 0.0 to make the game viewable area to be hugging the top size. I'm expecting the X/Y positions for the Custom AR to be anchored top left, so 0 vertical bias should fuse the image to the screen top.

That's exactly the issue I reported. Switch to Vulkan and it will appear as you'd expect. The Y position is only wrong when using gl or glcore.

Play with Bias Y and watch the viewable area in the background. You should see that one single frame where it appears where you'd expect before it pops into the incorrect position.

ADDING: I searched online for others having the problem. They are. Most are using GL and are advising others to set Bias Y to 1. This "looks" correct, but is a terrible workaround for a fairly obvious bug, especially for those who mix render modes.

Retroarch 1.6.8 Released