The histogram on the bottom of the screen is a generally smooth line from zero to 65,000. The only like I see on the histogram is red colored, not white the way the histogram appears in your videos. I moved the bars around but that didn't make any difference.
I am not even seeing the "picture frame" where an image would appear, just a grey area with bars when hybrid is selected, a black area with 0.0 when number is selected.
Is it OK to try and use the camera in the daytime with a polarizing filter to cut down on the light? That might make things slightly easier.
I know I have to be doing something wrong, probably something incredibly simple. I do have some experience with CCD cameras, but maybe my experience is hurting rather than helping. And yes I am pressing the play button, how else would the green bar be moving to expose the exposure being take?