According to the Winter Bash icon above, I've earned the Saint Lucia hat on both Math.SE and Meta.SE; however, when attempting to view it on either site, I'm faced with this screen. Checking the developer's console, I see I've received an error:
Uncaught TypeError: Cannot read property 'appendTo' of undefined cdn-prom.sstatic.net/WinterBash/js/core.js:2
I'm able to view others' hat screens perfectly well.
For what it's worth, I'm using Version 38.0.2125.104m of Chrome on Windows 7.