Unable to find a medium containing live filesystem.

Newer versions of gparted live are unable to find live medium, when booting from network. I use gparted on my public site http://boot.salstar.sk/ . Boots well with gparted-live-0.30.0-1, but all later versions including latest 0.33.0-2 fails to boot with a message, that unable to find medium containing live filesystem. Testing using a KVM virtualised guest. Let me know, if you need more information.