What version of Videopad is being used? Try a recent version. 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.
Save your project, using SAVE PROJECT AS (routinely), giving it a unique # and name to avoid overwriting earlier saves. Save Project (no AS) will overwrite.
Then isolate (split-out) a portion of the project that displays this jumpiness and delete the rest. Share that here or in private so someone can check it out. Don't export. Just follow these steps...
- With your project on the timeline, click the 3-lined 'hamburger' menu, top-left. Click FILE | BACK UP PROJECT FILES TO FOLDER. Specify a folder. Click SELECT FOLDER.
2. Using the PC file manager, go to where the numbered folder was saved and upload it to a free server - Google Drive, MS OneDrive, etc.*
3. Get a shared, public, non-restricted link.
4. Paste that link here, or click the folder, above top-right in this forum, and message it to me. This is private and won't be shared.
* Before uploading, right-click the folder, click PROPERTIES. Look at the File Size to confirm that it's not too big for the free space on the server.