$format not handled correctly in node preview

Currently the nodes Input format is ignored. This issue is in live.node.inc. You pull the $format out of the post, but then in your node_teaser call you use $node->format, which has not been set. Setting $node->format = $format fixes this, but I am not sure why you don't just pull from the post into $node->format.

Also, when you call check_markup, you are using $format before it is set.