The issue is that the new 1-450 Northrend professions files were not referenced in the Guides.xml files found in the DugisGuide_Prof_Horde_En and DugisGuide_Prof_Alliance_En folders.
My husband found and resolved these issues, and I am attaching the Zip file that he has created with them in it.
Just unzip to your DugisGuideViewerZ addon folder and overwrite the current files.
The only code that was changed is text fields and syntax errors, there is no logic change in these files.