This problem is bizarre. On certain websites, for example on forecasts on Weather.com, waving my mouse over the Safari buttons produces a dog-barking sound. I certainly don't recall installing any software that would make it do that. Here's a link to a page that does it for me:Link I'm totally mystified. Any help is appreciated. I suppose my next step would be to reinstall Safari. I just tried loading the page on my Windows box and didn't have any problems.