Safari (Mac) Users are unable to 'select' in a grid component

Currently running Workflow 7.1 (Workflow in use for 5 years - upgrade coming) and have recently been made aware of a strange problem. 

Safari users on Apple systems are unable to select items listed in a grid component.  They don't seem to have any other functional issues (list box 'select' still works) but 'select' in a grid has become impossible.  I'm having the same issue with Safari for Windows (v5.1.7).  Any assistance or validation of the issue in other places would be greatly appreciated.