I have just upgraded to XCode 6 and tried to build my Developer ID signed Mac app. However, I now get the following codesign error:
unsealed contents present
I researched this for a while today and none of the suggestions I found helped, my sdl_mixer.framework had five embedded frameworks that I couldn't get past iTunesConnect. My solutions was to remove three of them that I didn't actually need, and the other two were added to my project as standalone frameworks, not embedded in the sdl_mixer. Hopefully this helps someone, I spent hours on this.