When I select Bézier Masking for the event, the window opens as expected. I go to Mask 1 → Enable 1 → Type: Curve, then create the points for the mask and complete it by clicking on the first point. The mask appears correctly.

However, when I check Invert, nothing happens. If I uncheck Edit Mode for Mask 1, the mask disappears. And when I close the Bézier Masking window and reopen it, the mask I created is completely gone.

I can not get Bézier Masking to work at all. I am on Windows Pro 11 and using Vegas Pro 22.

Thank you for your help,
Kirk