I found a old link in the forum
http://www.oldversiondownload.com/oldversions/videopad-10-05-2021-01-16.exe
This version renders properly. ( I just randomly picked 10.05)
Exported video doesn't have any issues.
I have the latest version, reinstalled and re rendered same issue. I used the default setting for HD 1080P.
My PC : AMD Ryzen 5 4500U with Radeon RAM :8GB 64bit
Is there anywhere I can download older versions. This version is unusable for me.
As a test I placed 2 clips on project, preview plays fine as well as individual files.
Exported mp4 is unusable. Project rendered on 10.24 Paid version.
I have backed up the project ready to be shared, if support want to look at it.