http://build.webkit.org/results/Apple%20Mavericks%20Release%20WK1%20(Tests)/r158244%20(215)/results.html We're missing some black border on this one: http://build.webkit.org/results/Apple%20Mavericks%20Release%20WK1%20(Tests)/r158244%20(215)/csswg/contributors/adobe/submitted/shapes/shape-outside/shape-outside-floats-clipped-004-diffs.html Similarly, http://build.webkit.org/results/Apple%20Mavericks%20Release%20WK1%20(Tests)/r158244%20(215)/css2.1/20110323/overflow-applies-to-010-diffs.html
This looks a lot like the issue that led to http://trac.webkit.org/changeset/155683 and related patches again...
So these failures don't exist on debug builder: http://build.webkit.org/builders/Apple%20Mavericks%20Debug%20WK1%20%28Tests%29 I'm not sure why these failure are only visible on release builds.
Created attachment 215522 [details] proposed fix
Committed <http://trac.webkit.org/r158290>.
Oh, and I threw AppleLanguages into the mix because I happened to know that it's also read during NSApplication initialization, and some effects of that are persistent.