Why have the labels/names of the icons on my Galaxy S5 screen become garbled?

[AC Question]

I only see white boxes below the icons now, though the text is clear on the access screen, where I have to give my password or fingerprint...

 

[B. Diddy]

Welcome to Android Central! I've seen that posted before. Does it persist after a reboot? If so, then try a cache partition wipe: http://support.t-mobile.com/docs/DOC-10404