The problem I have encountered when using Blender as a video editor is that when I set keyframes the values do not stay set. Instead all keyframes adjust to a value of 0.0.
The keyframes appear in the dope sheet and graph editor. The graph shows the curve between keyframes but there is no adjustment made to the movie or sound.
Am using Blender 2.8. This is my first time using Blender as a video editor. Also first time using stackexchange. Let me know if there is anything I can supply to help explain the issue further.