The Videograbby YouTube downloader service is easy as you have seen. However, many people do meet many serious problems when using it. For example, the commonest ones like sometimes VideoGrabby down, unstable downloading speed, no more choices for resolution and formats, batch conversion not supported, only a few video websites to choose from and the bad sever which is frequently down. All those upsetting "VideoGrabby not working" issues create a great inconvenience for its users and it seems there is no way out except change your router.
And this article recommends you the quicker method: find an alternative to VideoGrabby YouTube downloader to help you download from YouTube and other sites.