Hi @Cyan, sorry for hijacking the post but I'm facing a similar issue, let me know if you want me to start a new one.
I've recently got a Wii, installed latest HBC, Priiloader, Wiiflow and USBGX. In my case, if I set Prii to autostart USBGX, it freezes at "Waiting for HDD: 19 sec left". Wiiflow...