Windows 7 Sony Vegas Pro 9.0c - Saving Problem

[Soulja Pixii]

I have recently made a very long video with Camtasia recordings, text, pictures, and effects and it only saves the first clip off the timeline when i click render! I have tried most of the settings and none of them save more than the 3 second clip! I know a bit about Sony Vegas from what my friends have showed me but they never actually saved it!