iVI is changing my video from 16:9 / iVI is squashing my video

iVI can't always tell the correct aspect ratio but you can force it 16:9. You do this by double clicking the video in the iVI Main Window, selecting Audio & Video and then checking the Force 16:9 checkbox near the top right of the window.

You can also set up a rule to do this automatically on all future videos. To do this go to the Rules Tab of iVI's Preferences and create a rule along the lines of...

If filename contains .mod then change to 16:9 aspect ratio (use the correct file extension for your camera if not .mod)

then every file you add in the future will be forced to 16:9.