Had something really strange happen while watching 2.7 recording with 3.0 update. While looking at side imaging recording I noticed in the bottom corner which shows the hertz, it was showing 462 hertz in place of 455. I then went to 2D recording and it showed 0 hertz, don't know why, so I then went to sonar settings and it showed 50 hertz, I went back to 2D and opened the sonar frequency at top and it had 83 and 200 but it would not let me pick anything, is it cause you can't watch older recordings with newer updates?