Hey there - there may be some small problems like this when using Safari on a Mac, and we're working our way through each of them so it's as smooth using Safari as it is other browsers.
The site currently works perfectly on Firefox on Macs (
www.getfirefox.com) and will soon be 100% compatible with Safari, in the meantime just bear with us for a tiny bit as we iron out problems like these. Keep pointing them out for us though.
Thanks
Tim