HI! Are you on El Capitan? And can you tell how to trash preferences?
Thanks!
Yes i am,
10. Delete user preferences
To delete the user preferences, do the following:
Quit Logic Pro X if it is running.
In the Finder, choose "Go to Folder" from the Go menu.
Type ~/Library/Preferences in the field and click Go.
Remove the "com.apple.logic10.plist" file from the Preferences folder. Note that if you've programmed any custom key commands, this will reset them to the defaults. You might want to export your custom key commands before performing this step. See Browse, import, and save key commands for details on how to do this.
If you upgraded from an earlier version of Logic Pro, also remove the "com.apple.logic.pro" file.
Restart the computer.
After following these steps, try to reproduce the issue you were experiencing with the default preferences. If the issue is resolved, reset your preferences to the way were before and then test again.