WordPress Dashboard Characters Messed Up

I recently added a new post, and afterwards, many of the text lines on the wordpress dashboard appear messed up, almost as if they are protecting from a security breach or something.

I have a screenshot here: http://miklos.co.uk/wp-content/uploads/2013/03/Screen-Shot-2013-03-15-at-09.32.07.png

I have tried disabling all plugins, emptying the cache, using a different browser, but none of these seem to work.

I am developing locally too, not sure if that has any bearing.

Many thanks for any help in advance