I ran into two problems when exporting data from the website and browser extensions:
1. Export is invalid CSV: If Secure Notes was used to add commentary to the password entry, it's often formatted with quotes, commas, and all sorts of unpredictable characters. It would be helpful if there were an option to export only the standard text fields (url, username, password, name, grouping, fav) and leave the freeform "extra" field alone. If you must export it, consider an XML or JSON export which would properly escape these characters. This is likely the reason some users can't get more than a few items exported.
2. Export encrypted vault also offers a download as a CSV file, but as it is encrypted, it ought to have a different file extension and mime-type assigned to the download. I attempted to open it in LibreOffice Calc and it complained that the maximum character length was exceeded, as it was not really a comma-separated-value file.
