My log-in screen appears with question marks instead of the usual text. (See screen shot – I have removed my log-in name from the picture). I am using MacOS Sierra 10.12.3 on a MacBook Pro (early 2011).
MacOS – characters in login screen replaced by question marks
displayloginmacbook promacosscreen
Best Answer
Try going to Applications/Font Book/ and do File > Restore Standard Fonts and restart.