I wonder if anyone has tested attachments with the beta.... or if it's just you. :shrug:
Go here
http://www.joshuapettit.comThat's beta 2 which isn't public yet. But quickly register a name and see if you can attach a file there. I'm going to do the same right now.
Also... is is just a particular file, or any file? If it's just a particular file, is there anything odd about the file name.