FYI, I solved this by removing this particular DLL from the GAC and re-registering the proper DLL with RegAsm. I think it was just a version and pathing error. Also, I really didn't need the GAC for this single-user app.

>To All:
>
>I have a C# app that calls a C# DLL that is exposed to COM (it is also used by a Delphi app). The C# DLL has a strong name and has been registered in the GAC. I also registered it with RegAsm. Trouble is, when I altered one of the methods in the DLL to accept different parameters and changed the Interface appropriately it behaves strangely. What I mean is, when I add this DLL as a Reference to the C# app, you can see the new parms in Intellisense and it compiles fine but when it runs it's still looking for the 'old' version. I have recompiled everything and even tried to re-GAC the app but no luck yet.
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>Any ideas, thanks!