I moved my VS addin to TFS and did a get latest on another machine. On the other machine the OnConnection method isn't called. I noticed also the source wasn't loaded when I tried adding a breakpoint. I solved the latter issue with creating the .addin file in the 'My Documents\Visual Studio 2010\Addins' folder. Now the addin gets loaded, but no method gets called.
I'm not sure what other steps I must do before it works. I noticed I have the same behavior on VS 2012. What am I missing?