Not sure how/why this happened, but after I updated my Waves plugins this happened to Amplitube4:
 
When initially opening the project in Sonar 

 
When clicking on Amplitube4 to open up the amp gui

 
None of the amp tones are playing.....just the direct signal. I've uninstalled Amplitube4 and re-installed it, but no luck.
Any help would be greatly appreciated.

Update....
 
I loaded another instance of A4 with the same saved preset (BTW, so glad I saved the preset ) and it works fine. I have no idea why the original instance is causing those errors. 
 
Anyway, problem solved.