New Launcher Log window Fails/Is Blank/Does Not Scroll when playing

Old launcher would open log window / console window when playing. Launcher Settings Keep Launcher Open AND Open output log both selected as in old launcher. Console stays up with no changes and Log window opens and is blank until world loads then displays beginning of log file from START of launcher and stays there. You can manually scroll down in log window and the log is there but it does not stay current.