Recently I got a Macbook Pro. I can't manage to copy any sing in mceditor to clipboard and paste. No solutions seems to work.
Command+V - does paste a text from the buffer, but Command+C does nothing, I can't copy to buffer.
As seen in this answer, you can use the ⌘+R shortcut to disable "Mouse Reporting" in your Terminal window.
Or you can leave "Mouse Reporting" on to be able to use your mouse in MC, but press Fn to disable it just while selecting text to copy.
More details in this answer.