i know this is completely crazy-sounding, but while i am waiting for my 45 seconds to go by, there is a medical Q & A (like a class lecture or possibly an interview -- although it's pretty technical) playing in the background. Sometimes a regular ad plays on top of it, sometimes not. i do have the mega ad remover enabled on grease monkey. it's always the same professor, but i hear different parts of the lecture. once or twice it has continued once the vid starts; usually it stops.
generally i don't have any other programs running simultaneously, and it's definitely not live, as i've heard some parts of the lecture a few times.
it's not as much of a problem as just really weird, and i'm wondering if anyone else has heard this...? or might know what's causing it?