"Workaround 6" in this Knowledge Base article seems to be the key for us. Eliminate any lines referencing Appearance objects.  Hmmm. That will reduce our codebase by 25%!

Steps:

1)      Open the designer.vb code for the form in question  (yes, this requires editing designer code)

2)      Open the search/replace dialog (Cntr + h)

3)      In the Search box enter exactly this->^.{.*Appearance.*}$\n

4)      Leave the Replace box empty

5)      Expand Find options and check Use: Regular expressions

6)      Replace All

7)      Save and close

8)      Rebuild

9)      Open form in Designer.

Hello,

Yes, a windows application can be configured to work with specific version when multiple versions are installed on one developer machine. But one project can use only version. What you need to do is to verify that you have set the correct versions , also as I mentioned before I recommend you to use the versions form gac. Sometimes the components require to load some related dlls that are not specifically referred  and the first place that the framework search is the gac. So to avoid to load the incorrect version you should set the referenced dll’s in your project to UseSpecificVerson set to true. This can be done when you pick the references dll and go to the properties window.

I hope this solve your problem.

Sincerely,
Dimi
Developer Support Engineer
Infragistics, Inc.