I have found similar problems with loss of rankings on Y and found that I can be number 1 in major search engines / portals with 100's of top listings on G but none on Y except using full URL otherwise only sites that have links to us show up. Good for them...! The site is also in Y directory but I haven't found it yet except in pay per click section. I was told by Y a while ago that site has not been penalized in any way but spider couldn't find it or access ISP so they suggested changing hosting company. Major hosting company denied it was their problem and Y has not been able to resolve problem. Moving site may work if that is Y's problem but question is whether moving site is actually worthwhile for the sake of 1 search portal or could others be similarly affected elsewhere.