I use screen command on Terminal on OS X.
When I want to scroll up I change the mode to Copy Mode by pressing Ctrl A Esc. Then I use my trackpad to scroll up/down.
However, sometimes (probably after I press some kind of hot key while I frantically try to copy and paste things), the scrolling with trackpad/mouse doesn't work. Vim hot keys such as j and k still works. It's only the trackpad/mouse that stops working. What it does instead is it immediately quits copy mode and scroll up the history of commands I used.
I need to know what is causing this issue and how to fix it without re opening the terminal.