There are two scenarios:
1. Formating HDD in WBFS format, copying iso through Manager ---> USB Loader GX sees the games
2. Converting iso to wbfs with Manager, formating USB flash (16 GB) in NTFS, copying wbfs file with proper naming convention into the wbfs folder ---> USB Loader GX doesn't see the games
Simple as that. Sorry, maybe I made some confusion in my posts.