I’m having this issue, too
my site http://moviefail.com
uses the Structure theme and I can’t for the life of me figure out what happened. All of my fonts are black and unreadable for some reason, and the white lines outlining the page are completely gone.
I tried going into Theme Options, but after selecting the “Use the alternate dark color scheme” option and hitting save, I get a page that says “Are you sure you want to do this? Please try again.” Nothing changes, and the box is still unchecked when I go back to the Theme Options page.