I had previously reinstalled the HP software which hadn't solved the problem but after your suggestion of a printer conflict I went back to basics and started over (as you say in the US!) so thanks for setting me down the right road. Of the printer and all the duplex options back in MS Word. After mucking about for a while I just uninstalled the lot, restarted the PC, reinstalled the printer and, Bingo! one iteration In LibreOffice, I need to specifically set up the print job to print the odd-numbered pages first, then reload the paper before printing the even-numbered pages on the other sidebut in reverse order. If your printer supports automatic duplex printing, the subsequent pages for your print job will automatically be fed into. I have updated the printers drivers and Win 10 but the problem still persists. Until recently I could print all documents double sided but suddenly, for no obvious reason, I cant and the only option I have is 'manually print on both sides of the paper'. v Preface This Operation Guide is intended to help you operate the machine correctly, perform routine maintenance and take a simple troubleshooting action as necessary, so that you can always use the machine in good condition. Thats inconvenient and requires manual steps. I have a new HP Envy AIO desktop and a new HP Envy 5640e printer and Office 365. I uninstalled the non-default version and instantly the default version of the printer ceased to work. If you want to print double-sided, you need to set up a custom print job to do it yourself. Follow the instructions on the computer screen. Using both hands put the paper in the manual feed slot with the side that is going to be printed on first facing up. There has never been another printer loaded on this PC so a conflict was not possible, however when I installed the printer it did show two iterations of the same printer but with slightly different names and one as the default and the other greyed out (both From the Advanced tab choose the Manual Duplex printing mode, and from the Basic tab choose the Paper Source to be Manual feed.

To enable the status monitor, access the printer driver and click the Maintenance tab followed by the Extended Settings button. Thanks for the suggestion Parth, it worked but not, perhaps, in the way you thought! Manual 2-sided printing is available only when Status Monitor 3 is enabled.

Guide to printing double sided manually