White Spaces and Mouse Slows down in Demo Video 2019

Hello,

I recorded Four Demo Videos in AC 2017 and Opened them in 2019 and there are white spaces within the video and the mouse slows down and then speed back up.

Any idea as to why this is happening and how to correct this. I’m on a time crunch and unable to re-record the videos as there were complete in AC 2017.

I’m hoping someone would be able to shed some light on this issue.

Many thanks!

Nelda