I noticed on v1.B1 and newer that when I built the drive and booted, when counting the windows install ISOs (before the main menu) it would get to XP (0) and then just jump to the main menu. Once in the main menu, I noticed that the "windows install" menu was missing entirely. After many hours of trying to fix this, I was able to fix it by replacing the file at _iso\e2b\grup\countfiles.g4b with a version from my old flash drive. My old file was dated 3/7/2016. I'm not sure if anyone else has had this issue, but just in case.