This is about me. I'm outsourcing some HTML/CSS work and I emailed the design to the layout coder.
He IM'd me today asking where a certain link goes and what the page looks like. I didn't understand the question and asked him to send me a screenshot of what the page looked like.
I had that gut feel that I'd fucked up, and given him design mockup v0.2 (0.3 was the final approved design).
I was right! What an idiot! It really sucks being dumb... He'd coded 99% of the layout with the WRONG DESIGN!