Henery,
I found this information from a Microsoft Forum Moderator.
This is a known issue in Build 10041. Microsoft is aware of the issue and is investigating a fix.
If you encounter this issue, try clicking the “Switch User” button, and then pressing CTRL+ALT+DEL to resolve the issue. It may take a couple tries, but this may temporarily fix the issue without needing to press the power button.
K.Z. Sharief Khan
Ex-Microsoft Forum Moderator