Have updated Office 2011. When I go to slideshow mode, the viewer window comes up for a moment and then goes away. PPT is in slideshow mode, I have the ESC to get back to toolbar, edit, etc.
Works this way both in dual display and mirroring mode.
11/11/2013 Update.
Latest Office update and no longer have the problem.
11/16/2013 Update
Incorrect on 11/11. Still having the same problem. It may be a dual monitor problem in Mavericks. When I go into Time Machine, the display goes black. Similar to PPT problem. I have to mirror displays to enter Time Machine.