Hmm, no one else reported such a problem yet.
Some possible solutions that I could suggest.
1. Redownload the game, and replace the files (with the exception of your saves)
2. Try playing through this part on another computer
3. Alternatively, you could try replace the discovery video with a dummy file so you can proceed. Copy another video, change the name to body-d1.webm and put it in the videos folder. Although you must be careful not to see who's in the execution video that's also in this folder. You would probably have to make sure that the folder view is set to a list, with not thumbnails.