This is a known issue in the 10.10 images, the default keyboard short cut to minimize windows is the windows key + D however as android does no have a windows key it defaults to just the d key.
This can easily be fixed by opening the keyboard short cuts settings menu and changing the short cut from just D to any key combo that you would not normally use.
This is a known issue for all devices with a nvidia tegra processor, it is something I am looking into but have yet to get a reason for it not rending correctly (the icons are missing from the launcher etc) for now it is advised for owners of such devices to use the small image which uses the LXDE interface.
Debian large v4 - Can't become root in terminal (debian is not in the sudoers file. This incident will be reported.)