Weird...Please make sure that the blue focus line is not selected in the timeline. If that doesn't work try resetting preferences: Close Premiere then Press Alt (Windows) or Option (Mac OS) while launching Premiere Pro. You can release the Alt key or Option key when the splash screen appears. To reset preferences and plug-in cache at the same time, hold down Shift-Alt (Windows) or Shift-Option (Mac OS) while the application is starting.