What Videopad version is being used? Try the latest. (Windows) 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.
Not seeing reports of a problem with Zoom, or in tests here. When the zoom is created, it is displayed on the timeline thumbnails.
If the preview box is clicked, the result is shown in both Clip & Sequence preview modes. 