This is going to be a huge problem for me - it seems like now Spotify opens automatically whenever I open itunes or add music to my itunes collection. I don't see any way to prevent this from happening with the preferences menu and if this persists I will honestly just delete this from my computer. I am using a mac OSX Yosemite and have the most recent version of Spotify.
After dropping starred playlists, eliminating the apps (50% of the reason why i like Spotify in the first place) and now basically being a drain on my computer for no reason whatsoever, I am counting the days until a reasonable competitor can basically make up for all of the shortcomings. The sad part is these weren't shortcomings to begin with, the actual product just happens to be getting worse.