I am using Vegas Movie Studio 9. I have some old video clips which were captured with either an earlier version of Vegas or a completely different program (can't remember; might have been Studio DC10 Plus which I used before). Anyway, when I double-click on the AVI files in Windows Explorer my media player plays the clips just fine, showing video and playing audio. When I pull these clips into Vegas to edit, the video doesn't show up. On my timeline the video track is just red. When I play it, the display window is black. The audio plays fine. I tried rendering, to see if it was just a glitch in the editing portion of the program, but they render the same way -- black screen with only audio coming through.
Any ideas? Is this a codec issue that could be resolved somehow?