(I'm hoping I'm not the only one who watched the Dr here). Now I heard from my friend that Amy Pond might be leaving at the end of this season. So along with him telling me that Amy was in a previous season (I only started watching this season and am not that far into season 1 even) for an episode where the doctor saves her and her family, thus that she isn't really supsoed to be alive. So along the lines of those two fact I think that the cracks in time are created by her continued existance because that shouldn't be happening should it? So the solution would be to cease her existance unfortunately. That's my nerdy theory so I was wondering what other peoples theories are.