Macchi I can attempt a reupload soon; not sure why the uploads are discarded like that honestly they must not stay available for very long on that server. I'll have to figure out an alternative means of uploading video.
But yes I'm on v1.2.4. and I didn't have any issues with 1.2.3.
In case another attempt fails, basically what had happened was we were on Beat-Up Bridge and I had grabbed an opponent that had fell out-of-bounds with me, and then I was locked in the black&white screen state without being able to use chickens/bananas/bombs. I was able to look freely in a 360-degree camera range as if I were still a playable character, but was unable to use those items since I never transitioned properly to that phase.