Following the recent issues with authorizing Citibank credit card accounts, I did as one post advised and disabled all online services for all Citi credit cards, and re-enabled. Finally all transactions are being downloaded into the correct accounts, no more missing transactions (at least so far).
But there's still a significant issue with the "Online Balance" reported in Quicken. It is almost always different from what is shown when I go to the account on Citi.com. Using the Citi Costco Visa as an example, my register balance exactly matches the balance shown on Citi.com. But the Online Balance is $630 less. So I am unable to successfully reconcile my account using the online balance.
This difference is EXACTLY the amount of two pending charges. To the penny. So somehow, pending charges seem to be deducted from the true online balance. I have "Pending transactions" turned off, as it caused too many issues, and I suspected it might be causing this as well.
Quicken for Windows, R60.15, Build 27.1.60.15.