These problems have been fixed in the latest version:
1. Mail Merge window now properly generates font size HTML tags.
2. HTML for blank characters is now properly generated in the mail merge window.
3. HTML for line breaks is now properly formatted in the mail merge window.
4. If only one field is defined, import job is now able to correctly parse the message text and import data.
5. Auto Send / Receive feature in the Tools/Options window now works correctly.
6. Signatures are now properly added to generated messages.