Well something went cattywampus with our rendering code over the night. We’ve recovered and we’re 99% sure what the offending little jerk of a function is and have reverted it. This led to high resolution tiles not rendering or not rendering properly last night.
This is the purpose of a beta :-). We’ve corrected the problem and I’m going to dump all tiles at zoom 10 or higher just to make sure we don’t have any incorrectly rendered.