Y E T I wrote:
Added experimental support for Drag’n’drop from the host to Linux guests. Support for
more guests and for guest-to-host is planned.
Good to know. I can tell you it doesn't work for dragging from my Win7-x64 host to my Linux Mint 13-x64 guest. The info shown when hovering over General > Advanced > Drag'n'Drop states "This feature requires Guest Additions to be installed in the guest OS." So I looked into that.
Guest Additions is definitely installed on my guest OS. All online suggestions (trying to uninstall, reinstall, update Guest Additions, etc.) break Cinnamon instantaneously. Even just touching the Device > Install Guest Additions (Host+D) option in the guest's Vbox window will bone the Cinnamon GUI. It is that
Shared Clipboard works fine. And otherwise, Cinnamon Maya runs superb virtually as I have it setup. I just won't be tinkering with this issue until things are exceedingly more stable.