User no longer able to view or export videos

I have a recent problem both viewing videos already in projects, importing videos into projects, or exporting videos from projects. This is only when logged in as the main administrator user on both of the computers. Only thing in common between both computers is upgrade to Aperture 3.4.1.

When try to import video cannot drag video into Aperture, and if use file lookup area do not see the videos. By the way if go to the video in Finder, they will play without problem.

In the projects I see a thumb nail of the video, but will not play. If click on the video just get a gray screen.

I have tried to re-install OS (one machine Lion, other Mountain Lion), and Aperture.

Also third computer where did not upgrade to 3.4.1 works perfectly.