There was mention of save / load problems (bugs) for some version(s) of the engine.
Are 'you' using the latest version of the engine?

*check return value of game_load?
--does the load fail outright?
*check format of button function?
*function not declared prior to use?
*superfluous while(key_any) wait(1); ?
*block inappropriate repeat calls for continu? (already mentioned)
*save / load incompatibility with modified scripts / level? (already mentioned)
*DYNAMIC flag?
Save Error (previous thread)