Hello -
I'm facing the same issue with the Shutterfly plug-in for iPhoto 11, after upgrading to both Lion and iPhoto 11. I too have called both Shutterfly and Apple regarding the issue, and neither was able to provide a resolution (both suggested calling the other...).
I'm wondering if you ever found a resolution? It seems that the issue involves the fact that the plug-in is installed *somewhere* on the computer already, probably because I installed and used it with iPhoto 09, but no one is able to help me locate it. If I could locate and un-install it, then I should be able to install the plug-in again. But it seems we have run out of places to look...
Again, if you did find a resolution, I would love to hear it! It's very frustrating!!
Thank you!