Recent bug, had it pop up today. When scaling the textures it simply flashes with every incremental change on the slider, the texture does not appear on screen and scales as it uses to, it simply flashes as it is changed up or down the slider.

Tried it in all resolutions and in both Edge and Chrome, and it still does it. You can still change the texture scale, it's just annoying as you have to see the change in the preview window instead.