I just upgraded to Firefox 45.0.1 and I installed Flash Player 21 apparently successfully according to the loader. But when I go to Acorn TC and load on of the shows I follow, Acorn's website reports that I need to load the most recent version of Flash Player. 21 is the most recent version of flash player for Windows 7 64 bit and I have installed it and uninstalled it several times with Firefox and all other software that uses flash player closed. I have even tried this in Firefox safe mode - all to no avail. Any thoughts.