Maybe this has already been address, and I and just haven't found the link yet.
I am running 3.4 w/ the current versions of DVDX, BootMii, and Homebrew Channel.
When I update my wii to system menu 4.0 the Homebrew Channel will not lauch it just opens to a black screen.
If you need some more information I'll be happy to post it, if not I would be grateful for a shove in the right direction.
Thanks