What Videopad version? Try this one.
If you are a registered user, remember that upgrades are free for up to six months. After that, your purchase will continue to fully function, but a fee will be required in order to register the latest. Always retain the installer file, though it's automatically backed up on the PC.
If this doesn't solve the issue, upload and share your project. Here's how ... http://nch.invisionzone.com/topic/23659-tips-for-getting-help-on-this-forum/
Someone will check it out.