@MisBloo: If you email a document through Amazon's Whispernet, I believe they mark the files as a Personal Doc. The new feature should only affect documents tagged with
[PDOC], directly downloaded to the Kindle via USB. I can't think of any reason why there would be a difference when emailing a document.
Please try this with a document you emailed to your Kindle:
- Delete it on the Kindle.
- Connect the Kindle via USB
- Add a [PDOC] tag in the Edit metadata screen
- Send to device
Does that place the document in Personal Docs?
What version of calibre are you using?
G