Hierarchy Slicer not correctly functioning for some users

We have used the hierarchy slicer in a number of reports and these have worked fairly well.  Recently i've had reports from some users, who upon clicking the drill down triangle, have not been seeing any change in the slicer selection.  These reports are being accessed through the browser, making use of 'Publish to the Web'.  Going back a few weeks ago, this same report was working correctly for these users.  We haven't made any significant alterations.

As the poor mug who has to support this report, i have dutifully recreated their scenario without getting the fault.  My first note is that this particular employee is using Windows 7, 32-Bit with Internet explorer 10 (10.0.9200.17609).  Is anyone else finding a similar issue?  Does anyone know if there has been a Microsoft side update that may have made Power BI less reliable for certain versions of Windows or Internet Explorer?