I have having difficulty getting any addins to load at the moment and am totally stumped as to what the problem is. I have even created a very simple addin from the (C#) template, compiled and registered it and it still will not load up. I get the addin to appear in the Inventor Add-ins dialog ok but it will not load for some reason. I have tried generating various .Net versions 2.0, 3.0 & 3.5 all produce the same result. I have also tried to debug the add-in by getting Visual Studio to launch Inventor but it does not even appear to be loading the add-in. I have dug out some work I did months ago and tried that but it does not work either. Is there a log in Inventor that may give me some idea as to what it is not happy with?
I am using C# in Visual Studio 2008 Pro & Inventor 2011.
I, too, have crossed this bridge. For me, it was several items:
Even though it compiles error-free and shows as an Add-In in the Inventor interface, it doesn't mean that there isn't a coding problem.
Check the registry to ensure the mappings for the DLL are correct and not conflicting. My solution was to copy the DLL to each client's Inventor directory and then registering it from there, not from a server.