The problem did not show up in PM immediately. I was doing various things with the photos, adding IPTC using the Stationery Pad or the individual info box, adding GPS co-ordinates, making arrangements, renaming, etc. I can't say exactly the order of what I did because I'm trying to straighten out 10,000 photos that have been hacked around with by MediaDex, Adobe Elements, Picasa and ACDSee Pro over the last few years.
But I know after making the additions and changes, everything would look fine in PM. Then I would go over to Picasa and let it re-index the pictures there. Then, I'd go back to PM and everything would look fine. (This was after I was starting to catch on thinking the problem was something to do with Picasa so I was checking it out.) Then, the second or third time after that when I'd look at the pictures in PM, the Location info would be in the State field on dozens or hundreds of photos. Location and State info doesn't even show up in Picasa anywhere, only keywords on jpg's so I don't know what's going on in the background there.
All I'm saying now is that I haven't opened Picasa for the past days and my photos are fine in PM, and I can also view them in XnView without funny things happening. So, I'm guessing the problem is Picasa, but who knows, it might be ACDSee or Adobe. If I see it again, I'll tell you.