I had been using MEP14+ for the last three years, worked great until I upgraded to Win10. Then every time I added a video clip to the timeline, it would trim each one to less than a one second clip, even though the clip played fine in the preview window before I added it to the timeline.
So I upgraded to MEP16+ yesterday thinking that the new version would fix any incompatibility issues with Win10. Wrong.... MEP16+ does the exact same thing. Video clip plays perfectly in the preview window. Then I drag it to the timeline, and boom - max I get on every clip is about 3-6 frames. Most of these clips are 6-7 seconds, but get trimmed to 3 frames. I can't resize it either way to expand the clip - the timeline only sees the complete clip as 3 frames.
By the way, I also have Cyberlink Power Director 14, and the same clips transfer perfectly to the timeline. I really don't want to learn a new video editing program, but I may not have a choice. If you can't fix this, I will have to get my money back and uninsall the program, which I don't want to do because I like the interface and I'm used to the program.
I am using the same system that ran MEP14+ perfectly under Windows 8.1 64-bit for years.