Unfortunately upgrading to knime 2.7 while using the 2.6 nodes breaks some functionality.
reading an instantjchem table using the normal database reader node it now
puts the cd_structure column in a blob column, for which knime 2.7 now
has native support. But the Advanced Molconverter does not know about
this new datatype yet, and thus fails to see it entirely.
the column to a String column (using the Column Rename node) clips off
the information of moderately large molecules, thus this is not an
the column to a text column using a SQL Convert ( SELECT CONVERT(cd_structure USING utf8) FROM MOLECULES ) does the trick, but as this needs to be changed in all workflows that use the database reader, it is not a workaround that we will use just yet.
OpenBabel seems to have the same issue with blobs by the way.