Hi! I tested the External Editor integration with the last version of AT Document from my AT Content Types. When saving the changes I'm getting this exception: Traceback (innermost last): Module ZPublisher.Publish, line 100, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 40, in call_object Module Products.Archetypes.BaseContent, line 81, in PUT Module Products.Archetypes.Marshall, line 95, in demarshall Module Products.ATContentTypes.types.ATDocument, line 94, in setText Module Products.Archetypes.Field, line 701, in set Module Products.Archetypes.BaseUnit, line 23, in __init__ Module Products.Archetypes.BaseUnit, line 32, in update Module Products.PortalTransforms.MimeTypesRegistry, line 231, in __call__ Module Products.PortalTransforms.MimeTypesRegistry, line 181, in classify Module Products.PortalTransforms.zope.MimeTypesTool, line 65, in lookup Module Products.PortalTransforms.MimeTypesRegistry, line 126, in lookup - __traceback_info__: ("'None'", 'None') Module Products.PortalTransforms.MimeTypesRegistry, line 269, in split MimeTypeException: Malformed MIME type (None) Christian