at the moment (due to the time of year) there aren't many videos in the pool to choose from, however, there should still be videos showing up for you (in some cases the ads are in the form of banners instead which you can skip after a few seconds), however it also depends on how many videos you've been already watching. I, too, had problems getting my videos to start the other day after I've already watching a lot (via the association widget). In most cases trying to reload the videos did work for me in the end, though.
what I said about the videos above should also apply to your case! In any way, I am sorry that you have problems playing videos! If you're not playing PTR3 (festival server PTR) you won't receive any Gold per round. For the regular PTR we changed the rules a while ago to only receiving 8k at the beginning of the round instead of getting 2k at the start of each era.
I hope that helps.