I run Retroarch 1.3.6 (as admin) and i go directly to Overlay Scale. Pressing left or right on the gamepad and Retroarch crashes. I can adjust Overlay Transparency without any problems.
Certainly sounds like a bug. We’ll look into it.
Seconding. I recently experienced this exact bug when trying out borders.
There’s an issue for it but it was unconfirmed. I’ve confirmed it and posted a backtrace: It doesn’t look like it’ll be too hard to fix.