Thank you for your reply.
It appears that SQL Monitor may have some issues with the latest version if Chrome (Chrome 26 was released the day after version 3.3 and limited testing was performed against the Beta). The development team are aware of this and will be looking at this for the next release. I recommend using the slightly older version where possible.
If anyone else encounters something like this, please can you email email@example.com
with the information that I requested in my previous post.