Thank you for your suggestion.

However, perhaps I have not been clear. There is no direct problem opening the company file, and once opened, all other accounts with direct connections (banks, major credit cards) function as expected.

The problem is associated with ONE account in the company file - a bank account that, while visible in Chart of Accounts (including the icon indicating that it is properly connected to the bank), in fact is not connected and as a consequence does not appear in the list of accounts available for downloading transactions in the Bank Feeds Center. The register view associated with the account appears to be fine, other than missing the latest transactions.

The crash I mentioned occurs not when closing the company file, but when the "Save & Close" button is clicked on the Bank Feed Settings tab when editing the specific account and attempting to activate online services.

I believe that there is an internal issue with bank connection (Online Services) attributes of that particular account - the question is, how can those attributes be repaired. I have noted in other posts the steps I have taken, to no avail.

Jack