I am using Mantra v1.8.0. I recently changed my blog to have the sidebar on the left, instead of on the right.
All of a sudden, the site turns into ... well, click the link and you'll see (NSFW!). Under Mantra Settings > Layout Settings, there is a slider to control the size of the sidebar in relation to the rest of the content. It's stuck at 0% for both sidebar and content, which I believe is causing the site to look like that.
I have no idea why it is doing this, as it was working fine before I changed the sidebar. Putting it back the way it was doesn't work, either.
Any and all help is appreciated.