Mail can no longer send attachments

Mail recently lost the ability to send attachments. If I drag an image, PDF, etc. in to the composer, it shows up as an icon with a filename below it, but clicking on the link results in a dialog that says "The file xxx could not be opened because it is empty". Attachments used to just show up inline and send properly. I'm not sure when this behavior started, but I can't seem to get attachments to work any more. Even if I right-click on a JPG and share via email, the attachment created is empty. What's going on?
Thanks,
Scott

Update... I tried all of the recommended solutions for resetting user permissions and ACLs, none of which solved the problem. I finally relented to re-installing the Mountain Lion upgrade and that fixed whatever was keeping Mail from adding attachments. One notable change is that when I was having the problem adding attachments, I would see warnings in the console from sandboxd complaining that Mail was missing file_read_xattr and file_read_data for the files I was trying to attach. Now that attachments work again, I don't see those messages. Perhaps something was hosed with Mails runtime configuration with sandboxd?

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Please read and begin using Can receive email, but not send email. I had a similar issue with Comcast mail (could receive by not send) and found my answer in this letter. For me it took resetting the outgoing mail and telling the system to use a password when sending outgoing mail. If you need help with that please advise and I'll tell you where to look.

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Mail can no longer send attachments

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