Ctrl+Z in Viewport triggers compositor I have noticed that when I edit something in the viewport, then hit Ctrl+Z (still in the viewport) the compositor (open in new region) will still update like I edited a node or had hovered over the compositor node setup while performing the key command. Is this a known issue, or is it a bug? 

Do any of you have the same issue?

I am using Blender 2.74
&#9096; CtrlZ is the shortcut for undo, if you have global undo enabled in preferences (which is enabled by default) then the undo stack can contain steps from multiple windows, this means that undo may change the node editor if you made a change there before going to the 3dview and doing undo.