Similar to the CC-800 error being worked on, I received error CC-506 today when attempting to update 9 Merrill Lynch accounts. The reauthorization process showed 2 of the 9 could (were) linked to existing accounts - the other 7 were flagged as "do not add to Quicken". After multiple tries, it said it had updated the two, but there were no new transactions. The last time, there was no error message, but nothing had been downloaded for any of the 9 accounts, which I verified by checking the M/L website. I have reported the problem to Quicken with screenshots.