David,
what kind of saw and what type of fence are we talking about?
If the blade is square with both miter slots, my thought is the trouble is with the fence. See if both sides of the fence line up perfectly with the edges of the miter slots over their entire length. If your fence has faces on it like a t square fence, you may have to shim on end or the other to get it lined up perfectly.
Good luck!
what kind of saw and what type of fence are we talking about?
If the blade is square with both miter slots, my thought is the trouble is with the fence. See if both sides of the fence line up perfectly with the edges of the miter slots over their entire length. If your fence has faces on it like a t square fence, you may have to shim on end or the other to get it lined up perfectly.
Good luck!