The 'radmenu' that houses the forum menu/photo galleries/PMs/user CP etc does not seem to be working on safari Version 5.1.4 (7534.54.16).
clicking on the links only adds a # to the url and does not go to any new page.
Same with the 'reply to message' button.
Basically... it renders the website almost useless....
Safari has been annoying me a lot lately, but i still don't think firefox is much better...

Do you have any idea if it's fixable? 

That version of Safari probably came out after this version of forum software was released. A new version is on the way and I will be implementing it here.
Until then, all I can suggest is you try a different browser. Most people use firefox or internet explorer with this site.