LSDJ needs to be alone by itself in the menu it is in.

so if you're putting it in both menus (pretty common, this way it doesn't matter how it loads really), you'll have two LSDJ ROMs on the entire cart, one in each menu.

and nothing else.  generally, the EMS menu will appear and either be missing LSDJ from the list, or have LSDJ but none of the others.

Can you have two of the same versions of lsdj a cart? I've noticed people tend to put the latest stable on one page, unstable on the other. Is that just personal preference? And do they two pages share the SRAM nicely, or is there danger that one version of LSDJ will mess up the SRAM data of another?

so if you're putting it in both menus (pretty common, this way it doesn't matter how it loads really), you'll have two LSDJ ROMs on the entire cart, one in each menu.

and nothing else.  generally, the EMS menu will appear and either be missing LSDJ from the list, or have LSDJ but none of the others.

I've only ever had One Copy of lsdj per page, and without anything else On it. It duplicated the file until I switched pages and back, and I have no idea why. Perhaps a listing glitch?

The .gb extension was only the problem on the emulator. The menu still won't load. I can post video or something If that'd help at all.

Right now, one of my carts has LSDj 4.6.7 on Page 1 and 4.6.2S on page 2, both patched to the brim with my preferred custom kits.

EDIT:
Stunning new development, when I first start GBUSB after trying to run it on my DMG it had 2 LSDj ROMS on it, but stated only 1game was on it. I read both, neither ran in BGB, Switched to page 1 and back, and it was back to one file, which was also unreadable.

EDIT 2: ELECTRIC BOOGALOO:
I forgot the .gb filetype, which is why.

Format and rewrite the flash a few times, this worked for me last time I corrupted the ROM in one of my EMS carts.