On system menus that the overlay menu isn't supported. Enter and Exit the wii settings then press and hold the 1 button on the black screen returning to the system menu.
I know why some of your hacks aren't working
Also if you are interested I have a [No Sound At All] hack that mutes system menu and channel background music that I found using UNEEK. (any region you need)
The sneek game list is working for me with r102. The only thing I did different was add priiloader hacks to the SMenu.c. (Thanks to gameking66 for pointing this out in the Sneek v2 thread.)
The priiloader hacks I'm using below
I like to use Sneek+DI for testing Reggie Stages. I can edit stages on Reggie_v2 and save them directly to usb Stage folder. (As long as the stage you created is not bigger than the file size of the original). And I can autoboot the game with sneek + priiloader on a bootmii IOS only Wii...
Right click My computer - Properties - advanced system settings - advanced - Environment Variables
Under system variables add new
variable name = WIIDEV
variable value = /c/devkitpro