We'd probably need more details to help, but first make sure you've got the final AD7 release, Build 8903 from 2018. You can download and install it from
here.
If you already have that installed or if updating doesn't help, please follow the steps in this
post to provide details on your source clip. Also follow the steps
here to generate and attach the DxDiag report so we can see the technical details of your computer.