If you recently started having trouble playing the videos on iPad, you can click this link Alternate Player to use an alternate video player that works with iPad. Click Here to switch back to the default video player.
Another option is to use the Chrome browser on your iPad. App Store Link
We use a CDN (content delivery network) to stream our videos through the standard html5 video player. It should work in all modern browsers (Chrome, Firefox, Safari).
If you are not able to view videos on mathantics.com there are a couple reasons that may be...