I'm looking at the TeX.sx site, and it looks like it's not being styled. Any ideas what's going on? I'm not seeing this on other SEs.
I noticed missing styling several times, but only when I used a bad connection, usually over 3G / UMTS, even though the page texts could be loaded. A page refresh, after the connection got better, helped in those cases.
As you mentioned other SE sites, it's a good idea to test another site right at the same time when the TeX site style looks bad. I'll check this as well when it would happen again.