sudden change in import, a single 5.1 audio track now is 6 mono tracks

Richard, thank you so much. I searched and searched and did not see that thread so thanks for the link.  This fixes the problem on a file by file basis after the clips have been imported, but I import hundreds of clips for a typical project and do not want to manually make the chage to each file. I've looked in the usual settings, project settings, sequence settings, preferences and would like to have it go back to what it has always done, import my clip with a single 5.1 audio track instead of converting it to six mono tracks.  Any idea on how to get this previous default setting back?