From Dirk Munson, Aladdin Systems Technical Support Manager: "There is, again, an incompatibility between StuffIt SpaceSaver (any version) and MacInTax files. Once again, we recommend that you label your MacInTax folder to be exempted from SpaceSaver compression (for example, one way is to add the word 'big' to the name of the folder). Compressing these files does not cause data loss, however, to access the files once they have been compressed, you would need to contact Aladdin Technical Support for specific instructions. It is best not to allow them to be compressed. If you are experiencing a problem with MacInTax files that have already been SpaceSaver compressed, a FAQ has been posted to our web site with instructions on how to resolve the issue."