I don't know about you guys but what I did was:
format a new gateway v3.04 partition on
uodate my sysNand v4.5U to emuNand 9.5
install the cia.
sign in my nnid
download the patch via home screen
Load mh4u
Talk to the housekeeper
then I got an error number (don't remember) but it said that I have to sign in eshop at least one time
started signing in (didn't download the patch because I already did)
go to the game one more time
retrieving information
and voila
ps: I don't know why dont' you guys install the .cia instead playing the rom with gateway
pss:sorry for my crappy english
The problem for us is, is that we're using retail cartridges not ROMs or .cia's. So the problem most likely lies with the fact that we're using retail cartridges on EmuNAND.