1. We test our themes in Windows and Linux, in browsers IE6, IE7, IE8, Firefox, Chrome and Safari. I can’t test in Mac at the moment.
2. I could saw the problem. For do a fix or tell you what do you need to change, I need the url, can you send me the url?
Just in case this is not a support question, because this happend when you change the theme. Anyway we will help you.