I'd consider the tools in the iPhone's Photos app to be amongst the most "core" features - yet there've been glitches in it for the past year where if you annot

I'd consider the tools in the iPhone's Photos app to be amongst the most "core" features - yet there've been glitches in it for the past year where if you annotate a picture (say, by adding text), the position of everything you've added is screwed up when you hit 'Done'. I'm sure that's the tip of the iceberg.