I am having a weird issue with the PiP effect in Vegas 18.0. I try to have the picture open from the top left corner to 30% of its size, then stay there until the last second when it should smoothly open up to full frame (100% scale). When I apply the effect I can only preview a kind of simulation when moving the cursor in the effect timeline.

In the actual preview the effect behaves strangely. The window does not go to full size in the last second, but stays at its size of 30% and just moves to the center of the screen.

When I then go back to the effect timeline and set the size to 1 again, it completely messes up everything before where the window is suddenly at 100%, too.

Something is terribly broken about this effect or I am doing something completely wrong. Please help!