Under Sysmenu Hacks, I have

Replace Healthwarning with Backmenu enabled (only enabled it after this problem occurred)
Region free channels enabled
Skip disc update check enabled
Remove diag disc check DISABLED
Disc auto start when right pressed DISABLED
Disc autostart DISABLED
Remove NoCopy Protection enabled
Region free channels from SD enabled
Region free Wii games enabled
Force Disc region DISABLED
Move Disc Channel DISABLED
No Menu BGM DISABLED

Under settings

autoboot: Disabled
Return to preloader
Shutdown to off
Stop disc off
Show beta updates off
Light slot on error off
Ignore standby setting off
System menu IOS 60

Hmm, I thought I had priiloader on; it's in fact PRELOADER. Version 0.29. I always get the download update v0.30 option, but all it ever does is download a changelog and stay in v0.29. *shrug* I also don't have any installed files.

Oh, and Systemmenu is v417.