virtualbox.org

I used to run virtual box on Lion with windows7 as a guest. No problem.
Since I upgraded to Maverick, the VM remains invisible. I can see in the virtual box preview that the windows7 VM starts properly, but I do not have access to the Windows7 VM screen.
It must have something to do with redirecting the display but I am clueless.

Could anyone help me please ?

Guys after trying a lot of things, I found the work around.
It has to do with the systems preferences settings in Maverick:
Under systems preferences, select mission control.
I unchecked all the boxes, closed systems preferences and restarted virtualbox. The VM screen appeared.

I hope it helps