Arbortext 5.3 M100 to 6.0 M040

I've recently upgraded Arbortext Editor from 5.3 M100 to 6.0 M040. We author SGML documents.

Couple of issues that I am encountering:

• Hitting the Enter button after a tag does not show the "Quick Tags." The preference "Show Quick Tags on Enter" in Tools > Preferences > Edit is checked. From Advanced, the "quicktags" preference is set to "On"
• Unable to use the mouse scroll button to scroll up and down the document.
• "Newline" breaks are appearing everywhere in the document. In the 5.3 version these breaks were not present. Any way to remove these in 6.0? It causes problems with our publishing system. Also, 6.0 allows you to use the "Enter" button and add multiple spaces. Can this feature be disabled?

Any help/advice will be greatly appreciate!

Thanks