Q: I download video but i don't have it in video folder

R: Installer.app try to fix permission of folder with chown command. If you don't have BSD installed its don't work. You have to fix permission yourself.
Set /private/var/mobile/Media/Skrew/* with mobile permission instead of root.

Q: I set a video and turned on "Enable video" but i see nothing

R: If you have summerboard installed, swith off "use wallpaper theme". Try with video inclued in archive (fire.mov and weater.mov). Don't forget to reboot after first install!