Thank you for your kind comments and for your report.
From what I read it might be a configuration mistake, or a bug. We'll try to figure it out.
Have you changed back to NTSC and disabled the PAL setting from within the Suite? What you describe is consistant with having it output composite video in PAL color mode and using an NTSC set to display it.
Thanks for the reply.
Yes, I think somehow the console is stuck in PAL for 240p test suite. I've already tried changing video modes in main menu, 240p/480i are all in b/w, 288p/576i are in b/w too and image jumps (which i think is normal as my CRT is 60hz NTSC only).
I also tried to disable PAL modes in settings and restart, still in b/w. Also tried to delete 240p suite folder on sd card and reinstall it, still the same.
Checked in any region changer and wii's video mode is indeed set to NTSC, and system menu/homebrew launcher and several 240p emulators all run properly.
YPbPr in NTSC and RGB in PAL both work fine, only composite is stuck in PAL.
Is there a special region on wii's NAND that 240p test suite uses to set video mode to PAL/NTSC but unused by other homebrew/system menu? I suspect any region changer doesn't change this region back to NTSC therefore 240p test suite keeps outputing PAL signal.