I know that there were a few threads about this recently and that the ad was changed.
I have noticed though, that when the ad is on my screen for longer (when writing a novel slightly longer post) that the rollover function is still on.
You have to wait until the wee girl with the tiger feet finishes dancing and then the other children join in. Then they start singing again.
My DC were straight over to the computer wailing to see the CBeebies again.
It is psychological ad warfare. Just when you think it is safe to go back on MN ...