I've retried it with your configuration.
NDS Lite, Slot-1 EZ-V, Slot-2 SC Lite.
It's not possible to run any GBA or NDS Rom if you boot the Slot-2 device (SC Lite) from inside the EZ V menu.
If you use the combination of EZ V / EZ IV everything runs fine.
Seems to be a problem in the actual EZ...