Ableton LIve 8 won't render entire song??

[Xauric]

Ok, so I've got two songs within one live set, and total they use up about 10 channels, ish. But every time I render the song, the rendered file will have bits and pieces left out of it. Like, the song that's render will have periodic 1-2 second silences throughout the song.

Any direct causes of this? Fixes, tips, etc? Thanks a ton in advance!

-Xauric

[footsy]

You gotta highlight the area you want (whole song and space after if you want alittle silence. then "export audio/video" etc..