Got a picture Jim?
Some times I get what I can only call a 'divot' towards the end of the board if I drop the end when one of of the board isn't in contact with the rollers.
The same basic process Bill described helps me to not get the problem. I usually only get though when I'm running long heavy boards through he planer.
Programmer - An organism that turns coffee into software.
If all your friends are exactly like you, What an un-interesting life it must be.
"A door is what a dog is perpetually on the wrong side of" Ogden Nash