Problem with iDVD Burning Discs-Freezes & Ejects at last step

when i'm in idvd , go burn disc goes through steps , @ last step asks if continue , burn freezes , won't allow push okay/yes button , ejects disc. happens several slideshows , several dvd's. using dvd-r's.
know causing? we're doing on macbook that's approximately 3 years old , it's running leopard.

 

can check console.app relevant messages when occurs?

 

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