Switch User - mouse and keyboard freezes

I have recently created a second user on my Windows 7 computer.
Now when I log into one user, then select switch user, the computer will load the Switch User screen, but will not respond to keyboard or mouse. I don't know if it is the computer that has frozen or if the keyboard and mouse are not responding.
If I log in and log out before changing users there is no issue, it only happens when I select Switch User.
Any suggestions would be appreciated.
I can provide additional info if required.

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