I'm kind of stumped on this one. I have a (popular widely-used) theme and some very common plug-ins: nothing that isn't pretty vanilla. And it's all been working just fine. Moreover, I've tried a virtually identical set-up on a different blog (in a different subdomain) and it's working fine.
So all of a sudden, the fonts are all wrong -- for every theme I have available -- in this one subdomain for this one blog. Different fonts for different posts on the main page, a supersized font for the sidebar and footer, etc.
Again, this same set-up works fine in another subdomain. And I've tried reinstalling the style sheet and turning off the plugins, as well as all the other themes I have. Same result.
Does anyone have any idea what could be wrong?