Sounds like your SD card corrupted. Start by running a check with Check DIsk, see if it improves anything. You can try clearing the settings by deleting the USB Loader GX folder (IIRC it's named something like sd:\usbloader, don't really...
I've runned the check, it said that was everything ok with the micro sd card. Well, I deleted the folder, and tried to installed the new version of usb loader gx, but when it opens it says "usb device not found" even with me holding B button at...
I have a SanDisk Ultra micro sd card (64gb) that I had used to play with usb loader gx on the past days, but suddenly when I transfered a game (Mario Strikers Charged) with wii backup manager to my wbfs folder the games dont play the channel...