Hello Jack Smit,
Try using this link http://cdn-static.viddler.com/flash/simple_publisher.swf?ref=&key=a83a6fef . You should see the video window re sized.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.