That’s a theme specific issue, more than a general WordPress one. I recommend that you check with your theme developer for support on it. The developer is going to be far more familiar with your theme than the rest of us are and may be able to help you sort out conflicts and issues faster.
They seem to have a good support forum. Here is a direct link to their forum for your theme: http://www.s5themes.com/forums/discussion/simplecorp/
Also, here is someone from there who is describing a problem similar to yours: http://www.s5themes.com/forums/topic/submenu-dropdown-not-clickable/
Thanks — I’ll give it a shot.
Worked out great, btw. Thank you for your help!