MacBook Pro won't run Skype anymore
My MacBook Pro (13-inch mid 2012, 2.9 GHz Intel Core i7 8GB 1600MHz DDR3) won't run Skype since updating to Sierra 10.13.2. I've tried deleting and reinstalling Skype and have carried out all the standard checks, but to no avail. FaceTime doesn't work either. Can anyone help?
MacBook Pro (13-inch Mid 2012), macOS High Sierra (10.13.2)