restored default key commands, now mute is weird...

[dissonance]

on Logic 9, just the "M" key by itself would mute regions when the main window is open, and active (mouse clicking in that window), but the "M" key would also mute selected midi notes if the piano roll section was open and active (via the "P" button in main arrange window). But now, in the latest Logic version, after setting to default keybindings, no matter if I mouse click in the main arrange window or the attached piano roll bottom tab area, it always mutes whatever region I have selecte in the arrange window, never muting midi notes like i would like the "M" key to, when the piano roll tab is active. How do I make it how it used to be?

[David Nahmani]

What you're describing is the new expected behavior in Logic Pro 10. You have to press Control-M to mute regions or notes. 

To revert to Logic Pro 9 behavior, choose Logic Pro > Key Commands > Edit, search for Mute Notes/Regions/Cells/Folders On/Off, click Learn by Key Label and press M.