this may sound dumb, but do you have both PAL & NTSC monitor drivers in Devs/Monitors? cos it works ok for me unless one of them (and it can be either) is removed... ie. selecting NTSC will not work with out both the NTSC & the PAL drivers pressent... this seems to be a bug in GUI as I have started it in PAL on a PAL A4000 from Shell with no monitor drivers in Devs.