Why can't I print two-sided from Safari?

ez2bme63 Said:

"Why can't I print two-sided from Safari?: The area is gray where it says two-sided printing. I didn't change any settings and it was printing two-sided for a long time."

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Reinstall this Printer:

Uninstall this printer, and then download and use its drivers from the manufacturer's driver site (and none other). Seems the drivers have become corrupt.

What's the model of your printer?

ez2bme63 Said:

"Why can't I print two-sided from Safari?: Nevermind, found my answer with a google search."

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So, what's the answer? Providing that, along with the model, may help many for certain.