Just guesses...

Do you have a macro that changes the orientation before it prints?

Any chance that something bad is happening at the printer? If you change to a
different printer, do you get what you want? (Have you checked that printer's
settings?)

development chef wrote:

I have used an excel workbook for a couple of years with no problems but it
has now decided to print only on portrait although the print settings are for
landscape - any anwers?

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Dave Peterson