I think that possibly before you remastered your install, you haven't installed draklive-install package in synaptic again (automatically removed after the installation)
If you would have done a full upgrade before making that remaster, the mylivecd script would have been updated, with a requirement built-in for draklive-install (done by Texstar)
extra handy is to make again a install-icon on your desktop that launches draklive-install