I've tried my best to get more info on the problem that people are reporting to me. Only one person responded to my messages and I think he was just distracted by the ad and didn't notice the skip button.
He originally sent me a screenshot of the ad, explaining that the skip button wasn't there. When I asked for a screenshot that contained the of the top of the page, the skip button was definitely there, although he said it wasn't before..
So, either these users simply can't see past their nose, or maybe iLivid are breaking the iFrame to force people to download at the end of their countdown? It's the only 2 possible explanations I can think of.
User error is definitely the most likely cause, because I've never seen any problems from people that I actually know.