Brief follow-up: I have just tried your suggestion of clearing the “Allow newlines in double quotes” check box in the CSV page of the Customize dialog box. That did indeed make my test file display properly. I believe it is working properly for my original source file also but should check some details to be certain. It also made the display in csv mode *much* faster. Thank you for this suggestion. I’m not sure that I understand just what is happening though — have not been able to spend much time on this today.