I use the function expresso from the affy package for normalizing microarray data, and tell expresso to use vsn as normalization method. This went fine for years but the current version of vsn (3.42.3) no longer exports the normalize.AffyBatch.vsn method. Hence, expresso no longer finds vsn as normalization method. Is this a bug or intention? If I force the export, expresso seems to execute vsn-normalisation as expected.