I have a few addins that we created awhile ago.  They were originally written in .net 4.0 and developed on a machine with windows 7 running.  We are migrating to windows 8 soon so I have been testing my addins.  They will not register in the new environment.  Does anyone have any pointers or tips?  Did any of the add-in requirements change for windows 8?

Thanks in advance

Jason