rendering of list view in agile screens obscures buttons in safari 4

Go to the Planning Board under agile.
Choose List view.
For this particular example, choose project overview. Make sure you have some stories with subtasks. It doesn't really matter which list you look at though - they all display a similar rendering problem.

In Safari 4, the edit button, expand/collapse button, parent link, create subtask button and link to number of subtasks (ie 13 subs) are all obscured or drawn over top of each other. See screenshots, which compare view in firefox 3 to safari 4.