Lion DiskMaker 1.6.2 is now available on the download page. It corrects a nasty bug in version 1.6.1 where it chose an incorrect volume, and if one was going to fast (and did not read the message…), BOMB ! Sorry if this happened to you :(
I prefered to go back and not try to choose the “right disk”. Instead, you’ll have to choose the correct volume manually, and there will be a last warning message in any case.