davesultra said:Totally normal, especially with a nitrocellulose finish.
MG is right on the money. If there was no binding, the guitar would probably be exhibiting some fret sprout which happens with the wood dries out and shrinks.
All of the above, of course. And if you'll notice, the crack is right where the tang is for each fret. That would make perfect sense regarding both Marty's and Rich's observations.That's very common. With temperature and humidity changes, metal responds differently than wood.