Masking question

1

ok masking solved now, can anyone tell me why this works:
http://www.g36.net/flash_dev/works.swf

while this does not:

http://www.g36.net/flash_dev/does_not_work.swf

here are the sources:
http://www.g36.net/flash_dev/works.fla
http://www.g36.net/flash_dev/does_not_work.fla
http://www.g36.net/flash_dev/text.txt