The new sort order is a text field. It always has been, but as it was all numeric it may have been treated as a numeric field somewhere within your processing, although I can't duplicate this effect, this would explain why it is being converted to a number. Treated as a text field it will give an order which is taxonomic, Kingdom, Phylum, Class, Order, Family, Genus, Species and is alphabetical within these. There are two problems with it. Firstly, for groups where sub orders are important in the taxonomy, the families are in alphabetical order and this causes problems (eg.lepidoptera, with butterflies and moths). Secondly, within families taxa are in alphabetical order which doesn't take account of the taxonomic order present in some lists.
The Batch update will put the order back to exactly what it was before, including the problems and anomalies.
To run the Batch Update copy it into the Batch Update folder of R6 (with R6 closed). Open R6 and it should appear in the Tools/Run Batch Updates under the Sort_Order menu. There is nothing else to do. For the moment you will need to run this Batch Update after each Dictionary upgrade. Running a rebuild of the Taxon Name Index will restore the new version.
I am working with the NHM to get amore refined sort order where possible, but this is not easy to do. You can get so far with most groups and then it get very difficult and time consuming.
The best we can do at the moment is to give users the choice of which version to use. The new version which is a taxonimic order, or the old version with the anomalies.
Mike Weideli