I think he's talking about the bundled version where Super Mario World and All-Stars were combined in one cartridge.Cannot reproduce this here. Make sure you have a good ROM, that it isn't truncated, and that your card is formatted using the Panasonic SD Formatter with the size adjustment option set to on.
Alternatively, a subgame other than Super Mario World is freezing; I assumed it was Super Mario World for my quick testing, because you added the suffix "+ World". If it's not World, please state which it is.