Field information is not extracted after performing a version upgrade.
Under certain circumstances, upgrading might set the indexing format default of AutoSenseINSO. If your extractor requires a different format (i.g. ANSI-Nowrap) then the extraction may fail.
Check the indexing format for the index being extracted from to see if it is appropriate for the extraction being performed. For example when extracting tagged information from an HTML file, then 'ANSI-Nowrap' should be selected.
6.1 Service Pack 2