Can't Answer Phone Unless I unlock it.

[Barb-in-NJ]

Since one of the last 2 upgrades, I can't answer my S4 without unlocking the lock screen. It wont display the caller either (except for a fraction of a second). Too short a time to even see who is calling. I used to be able to see who was calling as well as to answer the phone while it was locked., Help!
Is this an undocumented feature of the latest upgrades? Does anyone have a workaround please?

 

[B. Diddy]

Welcome to Android Central! Do you have any 3rd party apps installed that have any control over the lockscreen or the dialer?

Try booting into Recovery and wiping the cache partition: http://support.t-mobile.com/docs/DOC-5744