I ended up uninstalling and reinstalling BV today to see if that made a difference.  Now I can get into the Maxis-made lots (at least Pleasantview) but I can't get into my created lots.  None of them work--even the ones that haven't been played since I got BV.  

Any ideas as to why the Maxis lots work but the custom ones don't?  Doesn't seem to matter if I have cc enabled or disabled, either.

No hacks--removed InSim and InTeen.  Ran Clean Install and found nothing.  I did have a ton of Tour Guides and Charleton's in my one neighborhood that I had been playing since first installing BV.  Not sure how many as I didn't count them.  Am I doomed to losing all of MY lots?

Freakin' EAxis.

After digging some more to try and find out what's going on in my game, I ran across this post at the Sims official site.  http://bbs.thesims2.ea.com/community/bbs/messages.php?&openItemID=item.189,root.1,item.43,item.104,item.41,item.127,item.23&threadID=cb151505c1575dfa4fc5ab43f80dcba9&directoryID=189&startRow=1

I checked my neighborhood where I had been playing, and thus sent one of my families on vacation to all three places (one they were forced to go a second time as the shuttle screwed up and made them go on vacation again right after they returned home).  Sure enough, I have almost 800 characters in that neighborhood.  The others have around 200-400 give or take.  

So now I'm definitely wondering if this is the problem given it had been running completely fine until yesterday.