Make sure to follow the steps below in order to complete the process to clear the cache and retry to export your project:
1. From Videopad, select the Tools=> Options => Disk tab > "Cache folder" section => copy the folder path.
2. Paste the path on your windows folder explorer, this will open the Cache contents.
3. Delete all files within this folder. (Will have to close Videopad for this to work, most likely)
4. Close Videopad and re-open it again.
5. Re-load the file and then export
ALSO: exporting to my Vimeo account directly loads a better, larger, file with smoother transitions. THEN, download onto USB stick.