Bug concerning Markdown and WikiWord reference and forced log-out

[mhr]

I'm not sure how or why, but all of a sudden, if I'm editing a page, and I press the Markdown or WikiWord reference, I get logged out, and the background changes from as it is in before.png to as it is in after.png. It's strange because I think that the Markdown reference popped up when I first noticed it and tried it out this morning, but now this is happening.

[mhr]

 I forgot to mention what browser I'm using! I'm using Firefox 23 on a Windows 7 machine.