I can't export my walkthrough - as it's processing the viewer animation in render quality, it never reaches past 46% complete and in the end never allows me to cancel operation without me forcing Revit to shut down. An Avi. file is immediately created, as if it's finished, but when trying to open that the error reads: "Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file."...…………………..I've tried the process 2 dozen times, so I'm lost...