Windows 10: Blank Lockscreen win10

My pc is just showing blue blank screen on the lockscreen like this:


And when im trying to change the picture I just got some infinity loading like this:

any solution? thank you

:)

 

Win10: windows update stuck at never ending loop ?

When in win10:

• Update&security -> Windows update -> Finding update... .... .... ....

Planning to download the latest Win10.ISO (vers.1803) and manually update:
- Then wait that my ordered new SSD arrives and clone the old HDD to it.

 

Where are lockscreen photos in Win10

Windows 10 lockscreen pictures stored in C:\Windows\Web\Screen.

 

Lockscreen/Screensaver


What I am trying to accomplish (on a PC) is to have a slideshow play after like 5 or 10 minutes. Then, after 30 minutes, have the monitor go blank. If I press a key, be presented with the Lockscreen.
After watching and playing a little with the screensaver/lockscreen in Windows 10, Build 10074, I noticed that it is different from Windows 8.1. (For one thing, there is that mini-Sportlight.) In 10074 it seems to work in conjunction with the Screensaver, as opposed to cancelling it. In other words, before the Lockscreen slideshow starts, there needs to settings in the Screensaver. Otherwise the Lockscreen waits a set amount of minutes.
This scenario hasn't worked perfectly. Is 10074 having bugs in that area? If my settings for screensaver are 'None', then the screen goes blank after 30 minutes (which seems to be the Lockscreen setting). However, there is no Lockscreen slideshow playing the way it works in 8.1. How do I accomplish that?
Also, if the Lockscreen is presented, it shows the drab picture from Windows-Web-Screen, even if I select a Slideshow from my Pictures folder.
Any ideas or tips? Thanks in advance.