vt7: Can't download attachments to Documents. White Screen of Death!

I just reproduced this on demo.vtiger.com

Go to an Organisation record, select the Documents Related List, Add a new Document, upload a file. I uploaded a jpg image.

The preview option doesn't work - just gives an empty popup and if you click in the file in the List view, to download it, you get a white screen of death!

Also, in the Detail View of a Document, there is no option or ability to download the file attachment :-(