Ah, OK; sorry, hadn't heard of that device. As I said, I'm new to the Atari 8-bit scene :-)
Anyway, I had the same trouble loading the game via SIO2PC and RespeQT. In RespeQT, I unchecked "Use non-standard speeds", and now it loads fine.
Also, it loads consistently via SIO2SD if I bypass the Configurator loader tool and just mount the disk image via the buttons on the device. Configurator might be set to a serial speed that the game loader dislikes?