Yes. I opened the table to check. Now I found some errors in the tables that were joining the information in the query. My joins have SOMETHING to do with this. I realize now that each of the four tables I'm pulling information from (for equal joins of all four on ONE field) MUST have a match to execute. Now I have to audit the four tables to make sure that the information is there. That seems to do the trick.
I hate pulling in data from other people because I run into this a lot, but I have to start somewhere.
Thanks.