Online Update displays "Financial Institutions" w/ a blank checkbox

I have never seen anything like you describe, nor have I read of anything like you describe (though I confess, I do not completely understand your description).

I can tell you that Intuit says that under some conditions, you must deactivate ALL of your online enabled accounts (including accounts with financial institutions that are not experiencing problems); then do a Quicken Copy, then a Quicken Validate.

In other words: if you have not disabled online access to every single one of your Quicken accounts - even those not involved in your problem - you have not done all that Intuit recommends.

I have no evidence that this will solve the problem ... but it is simple enough to try it out, and if it does not help, you can always revert to the backup you make before you try it.