I have six seperate accounts at the same bank. Five of them I have had for some time with online account access enabled. I added the sixth account today and attempted to set up online access. At my bank all accounts are accessed with the same Customer ID and PIN so after setting up the account information including the account number, I attempred to set up online services by entering the same Customer ID and PIN that I have used successfully for the other accounts. When I click Next, Quicken immediately pops up an error message that reads "Quicken is out of memory and cannot complete the current task. To release memory, close other applications. Try restarting Windows or reboot your computer."
I'm sure memory isn't an issue as I am running on a pretty nice machine with 1G of RAM. I did re-boot just to be sure but that didn't help (as expected). I put a packet sniffer on my network connection to see if Quicken was actually trying to do query my bank and it was not.
Is there some limitation to the number of accounts you can have at the same financial institution? That's the only thing I can figure. I removed and re-added online access on one of my other accounts (at a different bank) and that worked fine.