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Originally Posted by shakran
it could also be your nut - if the #4 string slot is cut too deep it can allow the string to buzz the fret when it's plucked. You could try shimming that slot to raise the string up.
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Same could be true at the neck, too. Check out the whole travel of the string and see if you can find any place it seems out of position relative to the other strings, or close to a fret. If your action is low, of course, it might get hard to see...
Remember, new strings put different tension on the neck than the old strings did, and things aren't going to have exactly the same geometry they used to. In most cases it's a matter of microns, but with very low action, that can be enough to cause buzzing.