Two sided printing not working
I have a HP LaserJet Pro 400 m401dw printer and a MacBook Air.
I have always been able to print word documents double sided if I chose to. However the ability to do this via printer settings etc has disappeared. This problem seems to have occurred (but I cannot be sure) since a HP printer software update on May 9.
Is this an Apple or HP issue? Mysteriously I can still double side print from my iPad.
Thanks
MacBook Air (13-inch Late 2010), OS X Yosemite (10.10.3)