problems saving mail in raw message format

Hi

I am unable to save mail in raw message source anymore. I'm using OS X 10.9.5 (13F1112). I have had problems in the past with an error message about the number of characters in the name but this fix has resolved the issue Can no longer save email messages to my files. I've tried it again but it doesn't work now.

I select 'raw message source' as the format but the messages are saved as 'document'. They're not easy to read and I lose the attachments. Hope someone can help.

Thank you!