It's best to start a new thread with a descriptive subject - this one is nearly three years old.
How long is this project? What is the resolution of the bulk of its files? (Right-click a file in the bin, click PROPERTIES and look at the dimension numbers.)
When you export to a video file instead of directly to YouTube, does it display correctly? If yes, try using YouTube's uploader instead of VP-direct.
If not, please share your project. That's easy, quick and can be private. Follow the PORTABLE project instructions below. Don't upload the exported file.
http://nch.invisionzone.com/topic/23659-tips-for-getting-help-on-this-forum/
If it contains sensitive material link it in a personal message (PM). Click the envelope above. It won't be passed on or retained. Use FILE|SAVE PORTABLE PROJECT AS, not simply SAVE PROJECT, and don't forget to get a shareable (non-restricted) link to post.
Consider installing the latest release.
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.