I am new to the industry and this forum, so my apologies if this has already been covered. I have noticed on the websites I am working with that sometimes the Yahoo! Ads just don't appear at all. This seems to happen very infrequently, maybe 1% of the time.
Usually we show a stack of 3-5 Ads (depending on the website, the number is static for each site). When they don't appear, the entire stack is missing, when they do appear, the entire stack appears. Has anyone else experienced this? I realize 1% is small but it is still 1%.