Menu alignment/spacing issue.

I've just upgraded from Catch Kathmandu to the pro version, and somehow in the process, my menu got messed up. Currently, the menu is pushed to the right margin and has a white gap between it and the header. See image below: I have tried using this header left-align code in custom CSS: #header-menu ul.menu { text-align: left; } but it has not proved to fix the problem. Can you shed some light on this?