I have been editing 4 tracks with 3 locked to prevent accidental changes. I can copy a frame on the unlocked track, but cannot paste it back. After unlocking all of the other frames, it pastes back nicely to the target track. I am trying to paste the frame to the unlocked track, not any of the others. This is a strange error.
It may be related to the fact that sometimes when I copy a frame or section of a video, it randomly pastes back to a different track.
I had an inspiration, and found that clicking on the LH of the track and it turns blue, fixed the problem. However the help file was useless. It says "Paste: The contents of the clipboard are added into the current project at the position of the start marker." Notice it makes no reference to selection the track on the L side. Being used to OK, now I can do what I want. However using "cyan" for selecting the track and dark cyan for disabling the track display is lamebrained because it is easy to miss. Why not use Yellow for the M when clicked. When hovering over the track control buttons I see a display of the function, but there is no display for hovering over the other parts of the track control, so the option to select the track is well hidden. Another possibility is to Have a color ribbon appear on the length of the track which would make the selection obvious. I had been depending of the fact that when a track is not selected (cyan color) the paste would always be in the same track it came from. The best solution would be to emulate EXCEL where you click on the cell you want to paste to. Make it work like familiar programs! Another possibility is to have it give an error message saying "Click on the L of the track you wish to paste into" rather than just doing nothing. They need a good expert in how to make programs more transparent and easy to use as well as a good document writer.