Quick Start Example not Working

[dressguard]

I tried the Quick Sample in a VirtualBox but could not get it working:
"show hostname" and "show filename" are responding by "Could not find 'hostname'" and "Could not find 'filename'". I think this is to be expected as I didn't change the configuration of my DNS server. But "chain http://boot.ipxe.org/demo/boot.php" crashes my VirtualBox completely. GETting the page in a web browser from http://boot.ipxe.org/demo/boot.php gives me following script:

#!ipxe

kernel vmlinuz-2.6.17-14mdv bootfile=http://boot.ipxe.org/demo/boot.php fastboot
initrd initrd.img
boot

I don't know whether this is to be expected. So quick question: is the Quick Sample working right now or is it probably a configuration issue on my side?