Recently upgraded from Office 2010 to 2013. Cannot see embedded videos in PP slideshow. Can see them in Normal view when setting up presentation. I can hear the video, but the screen is black. Checked compatibility, video drivers up to date. Have tried Power Point viewer... no difference. Have tried videos from You Tube and not You Tube. No problems on same computer with Office 2010. Have uninstalled and reinstalled Office. Have done the Repair Office. Have tried to Link video...did not help. Help!!