I have the following problem:
I've been using Windows 8 PRO for a few months and everything has been OK, but starting a few days ago I can not log in. It happens when the system locks my screen after a period of inactivity.
The usual lock screen appears. Normally when I click it a text field appears where I can enter my password. However, once a day at random there is no place to enter my password and no user image. I can still move the mouse and the PC seems to not be frozen, but I can not log in.
How can I find the reason for this problem?