Tablo Windows 10 App black screen

I just installed the Tablo Windows 10 app from the US Windows store on my laptop. It shows all live tv and recordings as black screen but plays sound. Using http://my.tablotv.com/ in Firefox on the same laptop works fine.
My laptop is an older Dell Precision M4600 16GB RAM 320GB HDD which Dell doesn’t officially support with Windows 10 although I’ve been running it for years.
Video hardware includes on board Intel HD Graphics 3000 plus NVIDIA Quadro 1000M.