Be sure you selected the entire track. The whole track you wish to export should be darker in color to indicate it is selected. From start to finish.
I have selected what I thought was the whole track only to find out it was simply the first clip in the track.
If you click a few times on the track inspector it will select the entire track.... verify by dragging the project across the screen to see the whole track.
Also, you may wish to either use something like BOX.com or dropbox.com to send the wave. Generally waves are too big to go easily into most email inboxes. Another option is to convert it to MP3 for the time you are working on the project and then use the drop box method to send the waves to the person who will be mixing and mastering the project.
That is how I work on collabs across the internet.... MP3's for the tracking and waves go to the mixer.