@henrylflee: Yep! So, the reason it was a 2 to 3 day thing is because most of us rest on the weekend (support is generally handled from Monday through Friday) and this was bad timing. Very bad timing. I'm usually pretty vigilant about keeping up with this kind of stuff during the work week. Again, sorry for the headaches.
The technical side of this is that on WordPress.com we use CSS concatenation, which the plugin Galleria wasn't playing nicely with. Galleria is what Photography uses for its slideshows, and one of the lines to call it via JavaScript goes something like this:
css: 'galleria.classic.css',
Basically the CSS "theme" file that's used for your slideshow gallery is defined within the JavaScript call for Galleria, which was causing problems with the way that we concatenate CSS and JavaScript on WordPress.com. So instead of calling the file from within the JavaScript function we just made sure that the CSS "theme" file for Galleria loads via wp_head() instead.
In short, slideshow plugin + performance enhancements = hiccup.
Thanks for being patient, and let's hope that if something like this comes around again it won't take this long to spot it and get you guys and gals all sorted out.