Odd. Mine all did the same thing (signal out of range/no flifi output at times) but that ended with the 7.4 update. Only other thing I can thing of is to delete the PAL/NTSC modes with PicassoModeTNG (they should then show back up with default settings after a reboot), and IIRC there's a little something funky in the bootmenu, you might have two switch back and forth between the scandoubler settings before it will actually let you save (sorry I can't be more specific, it's been a while since I tinkered with the bootmenu).
