It is my opinion that the fence is flexing due to changed pressures against the wood plank, feeding to hard and fast, maybe also some blade flex added becuase of the before mentioned problems. Nothing else could make severe curved cuts like the one in your pictures without you seeing the movement thus solving the problem.

: I had this problem ripping strips from a 17' board. 4 strips ripped fine and
: then this. I had the same problem torwards the end of a 9' board, but was
: able to cut the problem part off. The question is, whats causing this?
: There are no visible defects in the board, there are many a feather board
: being used as well as some blocks (not the ones in the picture, they're
: just there to keep the strip standing for the pic) to keep the board
: against the fence. When I saw it start, I continued to slowly feed the
: board while checking to make sure the board was flat on the table and
: fence (which it was). Im using a Freud Diablo thin kerf (.050) 7.5"
: blade. Best I can figure is that the thin blade is being pulled by grain?
: Any thoughts? Thanks in advance. -Ted

: BTW I've got 4 strips up on either side of my Guillemot (stapleless) and its
: looking like Im makin me a boat *yeehaa* (providing Isabel doesn't nail
: Annapolis)