Using a new laptop with Win 8 but I am not sure its related to Win 8 but definitely related to Chrome browser, doesn't happen on Firefox or IE.
When I select a YouTube clip, if it is prefaced by an ad, the ad will play but the main video never loads. If I click on the chrome reload button the clip will then load and play.
If there is no ad in front, the Youtube clip never loads as above until I hit the Chrome reload button.