Blue screen when booting from USB backup of Mountain Lion
Lion Disk Maker is a third-party utility. It’s likely that updates to OS X changed the startup behavior slightly for how your machine operates.

Any reason you wouldn’t use Recovery Disk? (Command + R on boot.)

You can also try booting to the USB drive, but enable verbose mode (before you select the USB drive, hold down Command + V) to see if there are particular errors shown when it is at that blue screen.

Last bit of hope: the author appears receptive to personal technical support questions by e-mail (that’s pretty cool).