Do not PANIC. There is help here.
Save your work with FILE | SAVE PROJECT AS, so as to not overwrite a prior save. If FILE | SAVE PROJECT is used, it will overwrite.
Close the program and have your Videopad install file on hand.
Using Windows Explorer (the file manager) delete all files in
"C:\Users\<your name>\AppData\Roaming\NCH Software\Components"
"C:\Program Files (x86)\NCH Software\Components"
Reinstall Videopad. If feasible please upgrade to the latest version.
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.
If the issue persists, share your project (not the export) and someone will check it out. This is not difficult, takes little time and can be private.
Here's how... 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 link to post.