Frank,Did you download the update I posted last night (http://forum.strataframe.net/FindPost14187.aspx)? You might load this instead to see if it resolves the issue.
How can I change the reference to reference what's in the GAC?
LOL ...I am not laughing at you....but more at the situation. Welcome to reference hell . If you choose from teh .NET reference tab, we map to the c:\program files\common files\microfour\strataframe folder...however, .NET always looks to the GAC first, so under certain conditions, you may have one go to the GAC whil another pulls from the common files location.
But...at any rate here, the problem is not in these assemblies...it is coming from the Extensibility assembly. The type editors are not pulling from the correct location. Also, by loading this new install, I know that you will have the latest Extensibility assemblies. So that is where I would start.