I looked at your screenshot for a while and couldn't think of anything that would cause the Defer Panel Updates property to not function properly. Obviously it wouldn't work if it received an incoming error (but you don't have an error in wired, so that's not it). The panel will also redraw if you cover its window with another window, then move it back (but that's an OS drawing thing, I think, and it doesn't sound like this is what you're doing). Any chance you could attach a simple VI that demonstrates the problem? I use Defer Panel Updates all the time, and have never had a problem with it not deferring the updates as it should.