Lion screen sharing black virtual display.

I would like to use the switch to virtual display feature in screen sharing but when I choose this option my screen goes black.  A strange twist to the issue is the computer I have connected to switches to the login screeen.  The computers are mac mini(mid 2011) and iMac(mid 2007).  The mac mini has a clean install of 10.7 and the iMac was upgraded from 10.6.8 to 10.7.  Is any one else experiencing the issue?  Is this normal behavior?

Remote Login and Remote Management are checked with all available options enabled, same issue.  Also tried Screen Sharing and Remote Login checked, same issue.  Remote Login isn't necessary for Screen Sharing or Remote Management, it is necessary for ssh login.  Let me explain the issue I'm having, I can connect to the remote machine and control the machine but when I switch to virtual display under the view menu in screen sharing the screen goes black.  If I go to the other machine the login screen is displayed.  I'm assuming I should see the login screen on the both screens or on my screen(the host I initiated the session with) while the user can continue to work without interruption.  Maybe I'm wrong but it doesn't make sense that the computer I'm using would go black and the remote computer would display the login screen.  Maybe I have to enable fast user switching on both.  There isn't much documentation on the subject.

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