Thanks for your reply Lucille. No, I have not tried the Mondo patch. I don't know what it is. I have always updated using Quicken's Help>Check for Updates or by responding to the prompt that offers to update when I open Quicken. Could someone point me to a discussion that explains what Mondo patch is and/or why it is not part or a regular Quicken update? The link above explains how to install it but not what it is.
SOLVED! Thanks to Lucille and Jerry for suggesting and explaining the Mondo patch. The update proceeded problem-free. My investment and banking accounts now download properly into the lower part of the registers, as they had done before the problem recently appeared. Sounds like the Mondo patch is a good thing to have available for any future odd issues that may arise when an update is performed.