What happened to Manual Duplex printing?

[Nichiyoubi]

Manual Duplex option has completely disappeared.  The check box is gone, as if it never existed but it did!  Why are we no longer allowed to print manual duplex?

[Bernard42]

         Hello Nichiyoubi,

http://h10032.www1.hp.com/ctg/Manual/c02153847.pdf

Here is the manual for your printer, link above :

HP printers of this double-sided model are recognizable by the letter D in their name. If it has no ''D'', it is not front/back.

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[Nichiyoubi]

Thanks, but I am already well familiar with my printer.

I used to have the option to print Manual Duplex, which I did all the time.

Now, the check box for Manual Duplex has disappeared.

The instructions you sent make no mention of duplex printing, and are very basic.  But thanks for listening.