Hi Chris,
Sorry about the delay in getting back to you. As mentioned, I believe there has been some CSS that has been overwritten in your modifications (theme/standardtotara/style/course.css line 51). If you would like to send me your theme (via e-mail would be fine) I would be able to fix it and send it back to you.
Another option is that if you could e-mail me a login, I could confirm what the issue is and talk you through a solution (although I would not be able to fix it myself).
Regards,
Brian