Hi, i´m rigging a new character, and something really weird happened.
At some point, the mesh started to get a kind of delay in the deformation. I move the bones, and the mesh is somewhat a frame delayed in the movement.
There are no delay option activated or anything else, it just started to happen one day.
The solution I found was to delete the armature modifier and reapply it. Anyway, when I hide the mesh´s layer or sometimes when I enter the Weight painting mode, it happens again.
It´s kind of aleatory…weird…
Oh, and it all happens in the viewport, I don´t think it happens at render time.