Can someone help me with this site?

I built the template and the owner is complaining that the text in the center content box is flickering or not showing at all. I cannot recreate the issue and he won't tell me what browser this is happening in because he's convinced it has nothing to do with his computer or browser. I am assuming it is an old version of IE that is having this issue but I'm on a Mac and can't test this unless I connect to BrowserCam which doesn't show issues like this very well.

Can someone please test this and let me know what browser it's happening in and tell me what it could be. I'm guessing it is something that has to do with the css for that center div. div class BoxContent

The css is located here:

Thanks in advance.