Perhaps you did a System update that updated Safari?
If so, see this link: Problem with script Send Email with attachment puts email into a black box
This issue is documented in the Known Bug Listhere in the forum.
This list can also be downloaded as a filemaker database file for easier searching: http://www.4shared.com/file/2ZtniNbT/FMP_Bugsv3.html
Thank you, Phil!