Try clearing the cache and see if that helps.
"Clean the Vegas Pro or Movie Studio Platinum Program Cache
Sometimes mysterious alien artifacts can build up inside the hidden program cache and caused bizarre behavior. Do the following to clean out the Cache and Reset the program. Please note that this will reset the desktop display for the program.
Hold down the CTRL and SHIFT keys on your keyboard, and at the same time double click the program icon on your desktop to boot the program.
Select Delete Cache and Yes
The cache is now cleaned."