As I explained before, if I change the Chrome setting to download PDFs, then it gives me the Save dialog every time for all PDF attachments, regardless of when they were uploaded. That makes sense. Is that how your browser is set? Mine is not, and starting with files attached on 11/8, QBO ignores my preference for opening the file in a new browser tab. But files that were attached on 11/6 and earlier still preview in a new tab, as they have always done (I did not attach any files on 11/7). I did not change anything. This appears to be a bug in QBO that was introduced on or around November 6. I have read that new features are usually rolled out on the 6th of the month.

I have been attaching files for three years in my QBO checking register. This has never happened before. And as I wrote earlier, it is not a problem with my company file. It did the exact same thing when I tried attaching a file in your QBO demo company as your support rep watched.

Having to download a file that I just uploaded in order to check it is absurd.