To those who offered help and advice, thanks. I got the problem solved. Simple, really. I rotated the blades.
Duh.
I was surprised they got so dull so fast but, then, they're just steel and I suppose I have probably put more stock through the planer than I thought.
I suspect I need to have a couple sets of blades on hand. Changing the blades around was really pretty simple. I had been dreading it but it isn't difficult at all.
Anyway, the new edges cut like champs and I made about 2/3 bag of shavings/chips for my DC with it.
Ralph (who still has lots to learn!)