Problem with IQ tests in Murray's "The Bell Curve"?
After some significant searching myself I don't believe that what you've stated was one of the many criticisms of "The Bell Curve". 

It wouldn't be impossible for the review you read to go something like, 

"Murray's, "The Bell Curve" is akin to other racially biased research like as XYZ's "IQ Research", in which XYZ claimed that African students had, on average, lower IQs, but when the research was reviewed showed that those students had received a test in English, while their primary language was French."

Memory can be a tricky thing and the way connections are formed around subjects we don't use often is haphazard at best.