This is a bug from L9 that I hoped would be fixed in X... surely someone else has had this problem! While editing a selected region in piano roll, everything can be working fine, then suddenly when I perform another editing task - typically copying or pasting, or attempting to input step time notes - the function does not work. A workaround is to close the piano roll edit page, deselected the region I'm working on, then select it again and go back into the piano roll. It's as if Logic somehow 'forgets' the region that you're working on - even though it is still selected. Very annoying, and a pain for workflow....any help much appreciated.