Minor glitch with A3D + flash cart. Can you replicate?
Does your A3D exhibit the same behavior with your flash cart?
Which flash cart do you have?
I have the current A3D firmware (with "Memories" save state feature), but I suspect this glitch affects previous firmware too.
My flash cart is old (EverDrive v2.5), but it works great. I don't want to clutter my library with entries that don't correspond to my actual cartridge collection, so I keep going through the A3D library to remove everything that came from my flash cart. It's tedious because I have dozens of entries to scroll through for my actual carts.
I loaded Mario Kart 64 (Japanese) from the EverDrive. I quit the game and returned to the A3D library menu, where I found the newly-created entry and deleted it. I then press the B button to jump through the library to my current cartridge (still the EverDrive), but it will not allow me to launch the EverDrive! I power-off the A3D and reboot. Then the EverDrive launches just fine.
I've repeated this a few times. Each time I quit the game and delete the newly-created library entry, I cannot re-launch the EverDrive until I reboot the A3D. At least one time, the A3D's remote power-off function left me with a black screen while the A3D power light was stuck on. I had to get up from my seat to power-cycle that time.