That was my first initial thought. Upon looking though, I discovered there were no key frames. I restarted Vegas Pro 15 many times, I started a new project many times and made sure there were no key frames, so unfortunately that isn't the issue.

The first picture is the before shot, when I have everything sized correctly in the Track Motion feature. The second picture is the after shot, when I Trim Start or delete the first bit of split footage, it resets the Track Motion back to default size. As you can see, the video behind it is normal size, because I hadn't used Trim Start on that track. It only affects the video when you trim start on that video layer. Please, somebody help.

If you will notice, when you set Track Motion, there is a Keyframe at the beginning of the track. When you delete a video from the beginning, you also delete the Keyframe setting it back to default. I would save your position as a Preset and then recall it each time it gets reset.

I just did a little test, even dragging the key frame forward it still resets back to default, even if it is before where the key frame is. I have set the positions as a default, even before I made this post. I just wanted to avoid the headache of having to reset it each time. Oh well, if nothing can be done then I guess that sucks. Thanks for the suggestions anyway people 🙂

david-tu can type faster than I can make these little Oscar nominated episodes.

Hahaha, that Oscar joke amused me. Anyway, thank you for the video John. I do already have presets set, I just wanted to avoid the headache of it. Also, me being OCD, I wanted to figure out the explanation for the resetting, as my older versions of Vegas never did that. Seeing it do exactly the same on your screen showed me it is just how the new software works. Thanks for all the contributions.