That's a Fiery RIP, yes? I'd advise exporting to PDF and dropping that into Command Workstation or a Hot Folder, and avoiding the Print command altogether.
That doesn't really answer the question, I've already said the users can pdf then print that, they were able to use the print command previously
It's generally better practice to have an APPE RIP interpret PDF, rather than have the 'dumbing down' to the obsolete Postscript language that invoking the printer driver involves. It's more reliable and in the long run it will help with many potential issues. So you should always use PDF in production.
But with that lecture over... sometimes it's easier to cmd-P for quick comps, and I guess that might be your scenario. I suspect a printer driver issue/discrepancy. There are multiple places to select page orientation when printing this way, and a default setting might have changed somewhere. These include ID's Print dialogue, the system printer dialogue (invoked when you press the 'Printer' button in ID's Print dialogue), and under the 'Fiery Features' section of that dialogue. You could try checking that they all correspond, and save the appropriate settings if necessary.
Its not a production printer.
This (from another post" does work but is annoying, sure Adobe will say either a driver or firmware issue on the printer but if this does the trick so should InDesign.
"1. In the page setup dialogue box click the <Page Setup> button and choose the appropriate paper size there. Click OK.
2. Click <Setup> and choose <Defined by Driver> in the Paper Size drop down.
PS You have to do it every time you print. Annoyingly... but at least it solves the problem."