Im not an expert or anything but a few things you could try quickly...fyi i use the d2pro9 w/Wiiclip
1) try to update your d2ckey via a dvd/cd update found online. if there's an update menu, turn on update blocking- maybe there now
2) try burning scrubbed iso's with the update partition removed.
3)Last resort-You could update your Wii - latest is 4.3 but im pretty sure you'll lose region free with anything above 4.1 (just burn ntsc games and its not a issue really).
Those are just hardmod based ideas, thats all I use and can play the large majority of titles out there...i dont mess with softmods personally, but I know there are options there for you too....hope thats helps some