I just built a small project with PHPRunner 6.
Safari 5.1.2 running on a Mac can't process the Sort Function on Column headers. IE and Firefox browsers do not have a problem. The columns in Safari which sort so quickly in other browsers simply create a "loading" spinning gif that never stops.
I tried swapping out the latest JQuery file in place of the main one PHPRunner 6 uses but it made no difference. Searching around the forum I don't find any reports that specifically match this one and that have also found a solution.
I hate for all the Mac users to encounter this problem if they are using the default Safari browser.