Same issue here with all five of my accounts (1st Source, Chase, KeyBank, Lake City Bank and American Express).  No updates since the 18th.  In addition to all the things Support has suggested below (none of which work) I tried disconnecting each account and then reconnecting them.  They are unable to complete the data download (the final progress bar freezes) and the account balance shows as $0.00.  There is also no date showing when the last update occurred.

This is a mess - we're flying blind on our account balances.  I've tried their "manual download" suggestion before and it creates a lot of work.  First, the process to get the download the data differs for each bank, and second when Intuit eventually fixes this problem you will then have to sort through a lot of duplicate transactions once their automatic downloads come in.  Frankly, I don't know why they recommend this stop-gap as it causes more trouble than it's worth.