If you’re having trouble viewing the drill videos, we may have an explanation for you.
YouTube has recently switched how they serve the videos. They’ve switched from FLASH based videos to HTML5. Most browsers already are compatible with HTML5 video, but unfortunately, Internet Explorer isn’t one of those. It’s explained a bit more in the following article:
A good option for both PC and Macs is Firefox. Click here to download and see if that fixes the troubles. We’re all on Macs, so we’ve not seen any problems.