iTunes backup menus blacked out
When I back up my iPhone 6 on iTunes the menus on the backup page are blacked out. I'm using iTunes V12.4.3.1 on El Capitan. This is on a my iMac mid-2011quad core i7, 16gb ram. Any ideas what the issue is. Its been that way for at least a year.
iMac, OS X El Capitan (10.11.6)