Cannot log in after locking computer

Hello everyone.

So, as we all know, windows 10 has updated its version again around early this august and I have noticed a big change in the lock screen, notifications, etc. I was really excited at first but then suddenly I had encountered several problems.

The first one is, when I set my computer to sleep or hibernate, the background image before the login screen disappeared and showed a black background image instead. I guess it is just a minor bug that won't interrupt my work so I just let it be.

But now, the problem got worse, whenever I lock screen, I cannot log back in, instead after I entered my password correctly, the text box disappeared and nothing happened. So, I cannot log in until I reboot my computer.

So, I am looking for solutions to help me with my problem. I may be bad at explaining and really expecting for someone in this group have the similar problem and the solution as well. Thank you very much.

additional information:
The login problem occur occasionally and I think it was triggered when I make multiple desktops.

This is my lock screen before the login screen,