Visible stutter / jitter visible when playing but not in recording

Using current haxelib versions of openfl and lime. I’m experiencing an issue on neko and windows targets where I see jittering anywhere between zero and three times per second. My project.xml sets the window fps to 60. Jittering occurs when windowed regardless of vsync setting, but when fullscreen=“true”, jittering is greatly reduced. I recorded the game with fraps to try and show this problem, but the fraps output (recorded at 60fps) is completely free of jitter! Any advice on how I can proceed?

Problem goes away when I use openfl-dev from github