A couple of days ago I posted my anguished cry for help with my table saw. I just couldn't get it to cut square. Thanks to all who provided suggestions!
I pulled out the insert and removed the splitter and guard. It happened on crosscuts and rips, so I knew it wasn't the fence. My last gasp was to track down a full-kerf blade. I didn't realize how uncommon those are now, but I finally found a DeWalt for a price that wasn't too bad. Bolted it in, aligned, and viola! it cuts just fine.
Which was really only half the battle, since I didn't know what the deal was with the thin-kerf blades I had tried (including a WWII). So I had a good, long think about it. Then I realized that, other than the blades, the only difference was the dampener/stabilizer that I had used with the TK blades. So I grabbed it and laid a straight edge across the mating face. It was seriously concave. No, really. My feeler gauges don't go that big. Must have been at least 1/16". So this sucker was causing the blade to go concave as well. Once I put a TK blade in without this little demon, it cut just fine.
One more for the books, I suppose.