I use both Quicken Windows and Quicken Mac. Neither are using web update so they are stand-alone environments, and my securities are both in simple mode. When I do an update in Windows, my securities (401 etc.) download the account value as the cash balance, this effectively doubles the account value and I have to reset the cash balance to zero. When I do the same thing in Quicken Mac, it updates my securities properly.
Why the difference.