You've posted your issue under the Vegas Image category. Vegas Image is a still image editor sort of like PhotoShop or Corel PaintShop. Given that you've mentioned video, it would seem that you are referring to Vegas Pro rather than Vegas Image. If that is the case, please provide the information requested under sections B & C in the following link: https://www.vegascreativesoftware.info/us/forum/important-information-required-to-help-you--110457/

But first try resetting Vegas Pro back to its default/factory settings as per the following procedure: https://www.vegascreativesoftware.info/us/forum/faq-how-can-i-reset-vegas-pro-to-default-settings--104646/