I'm trying to debug why John's twitter addon isn't working for us.
I uninstalled the addon. The templates all disappeared so I assume uninstalling deletes them?
I then reinstalled the addon. The templates reappear but the template for the Master Style is now different to the template for my style (i'd previously edited the template in my style before I uninstalled it).
From this I take it that templates aren't deleted when uninstalling an addon but hidden somehow?