Assuming this is a direct upload from VP to YT, do you see the same if the project is saved as a video file, then viewed in a player?
What are your PC's specs: CPU/GPU/RAM?
Install 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.
Go into OPTIONS | ADVANCED tab and in the GPU processor section drop-down menu choose None (CPU only).
Which measure, if any, succeeded?