The issue is if Citrix Receiver is set to start with a reboot. It will flip the switch and you wont even know it. I disabled the auto-start on reboot. Obviously, I have Citrix Receiver for a reason....

Completely silent! I only found it when disabling all the startup apps in Taskmanager>start which restored the lock screen wallpaper. I then enabled each startup until it broke. For me, it was...

If you keep losing the lockscreen wallpaper it may be an app that disables "Animate windows when minimizing and maximizing".
EX. If you are using Citrix receiver, it WILL disable "Animate windows...

If you are using Citrix receiver, it WILL turn off "Animate windows when minimizing and maximizing". Other apps may also do the same thing.

I disabled all items in the "Task Manager" startup tab....