The reply says to be fixed by end of week, and two weeks have gone by as reading msgs.   My problem is not on MAC but windows.  Still broken.  Need to print and send in my return. 

The double sided would have to be a setting on your computer. Check your printer settings.

For years I had problems printing with the desktop program on my iMac. There were crazy workarounds and hoops to jump thru to get it to work. I  switched to the Online version for that single reason and never had a problem since.