I use VideoPad v 11.80 NCH Software. I bought it by the Microsoft store.
I already tried the Clear Unused cache files. It changed nothing. I did a clean install today.
Everything else works when I export, only the last 3 transitions don't. I made a test file to see the problem without having a complete movie to save space, but with the idea of what I usely make. I exported the test to make sure the problem still accurse and it did. The first transition, the closing doors works, but then the 2 cube spins don't. When using other transitions, I have the same problem. I put the exported file: "test" in the map "test no transitions".
Test no transitions
I hope it all worked as you asked.