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I am trying to find data at the block level or even block group level for the SF1 files and ACS 2010 or 2009. Just recently, two months ago, I was able to get this data but for some reason I am now only able to get it at the census tract level??? I have followed all the ways in which I am suppose to extract this data. Did this change?

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ACS smallest level available is block group, and that is only available for the 5 year estimates (same goes for Census Tracts). Also I don't even think those are available on AFF. – Andy W Apr 29 '12 at 19:35

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