I had this problem early on when I was using a security software that blocked ads. The only way I could get the ads up was to turn the security program off for 5 minutes, work the daily click and then put the security program back up. Never liked to do that. This was several years ago when I was using Norton 2004 or earlier.
When I upgraded to Norton 2005, it had the facility to turn ad blockers on and off so I didn't have a problem with that version. But in 2006 and later, they eliminated that feature; I stuck with 2005 for several years.
Eventually, I upgraded the security program to 2009 and they had changed the internal processing so it was not a problem any longer. (They stopped blocking ads unless it was deemed malicious).
It's also possible that your browser has internal ad blockers in it. So changing your browser might help. Tho I don't have any problems with IE, FireFox or Chrome -- re blocking ads. I usually use IE with FC. Seems to handle the video ads better.