Blu is right. The PUO editor usually shows you the state of each PUO. But for the VOBs, it's impossible, as PgcEdit doesn't check them in the VOB files before displaying the dialog (as doing so could take much time) and furthermore, a PUO value can change in the different cells of the VOB (and even in the different VOBUs of each cell!) Therefore, in the PUO plugin, the checkboxes have a different meaning. If you leave a PUO ticked, that means that PgcEdit will NOT modify it. If you clear a checkbox, the PUO will be cleared in the whole VOB file.