So uhhh... having a problem with the MadCatz Wii component cables I found over the holiday at GameCrazy. (Just to preface, I don't trust the brand but they were $19 and I took the plunge -- this probably explains my problem, but just in case it's repairable, I figured I'd post here.)
The cables have worked great since I hooked them up Tuesday night, and I've mostly just messed around with the channels and the VC with them in (although I did run around in Zelda a bit, just to check it out). It all worked great, and looked wonderful. So today I decide I'm going to check out some GameCube games that were progressive-scan since I never saw them through anything other than composite and I pop in Super Mario Sunshine. I hold B at the beginning, and the menu pops to ask me if I want to switch to progressive scan, and I do... so I select it. Instantly the screen goes crazy, becoming some kind of seizure-inducing rapidly-moving jumble of the SMS intro. So I'm like "Oh shit" and power off the Wii. Turn it back on, and the shit is happening on the warning screen at the beginning now. Power everything off, unplug everything, try it again... same thing. Switch it back to composite and it works fine.
Any idea what happened here? Is it a faulty cable that was on the verge of extinction, or is my Wii's 480p output mode busted? Any ideas? Any help would be severely appreciated. Thanks very, very much in advance.