virtualbox.org

Im using Windows 7 64-bit as host and I can't seem to get file drag and drop between host and guest using Ubuntu or Windows 7 32-bit as guest.
I've installed the guest additions and I have selected bidirectional drag and drop within virtualbox.
I've searched everywhere and all I can find are really old threads that have no solution. Am I missing something?

DnD is a work in progress.

Thats what I've read.
Its obviously functional enough that they've added it into the software though.
So in what situations does DnD function? who has it working and what do I need to do to get it working? does it only work with certain linux distros? am i missing drivers on windows?