Yes indeed, I did notice this for months and im sure of it now. Yahoo has its own sandbox filter but I prefer to call it the Time Filter which explains everything.
The google sandbox effect depindes on many factors such as the website age, website content, your targeted keywords, age of your inbound links and the quality of these inbound links.
Yahoo however does not depinde on many factors such as Google. I noticed that the two most important factors for Yahoo, are your website age and the keywords you are targeting.
Anyway, im not really surprised by all this because Yahoo has been known to clone Google for a while now. The most important for us is to hang on and keep updating our sites with quality content and backlinks. Once our sites get out of this sandbox mess, traffic will start pouring in as well as income 
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