I do have the same problem: Smart Lock is showing me only a blank screen. So i did a factory reset and it worked again. But two days later I noticed that it was a blank screen again. In between I added the apps I needed, changed some settings and added a Samsung account. Is it really beause I did add the Samsung account? So I removed the samsung account, did a swap of the partition cache. Guess what? Nothing worked. The only thing I can do, is to perform a new factory reset and after adding each app or after changing settings, I need to check the smart lock to find out when it is showing me the blank screen again. Sigh.
Actually this is a problem I expect Samsung to fix.