Non-Printing buttons Printing from PDF

Help me Adobe Forums!

I'm on a Mac on Creative Cloud. I have an interactive job set-up in InDesign. Multiple buttons on first page which control what shows in the rest of the document by using "Set layer visibility" action in Acrobat to control what's showing.

So there are 3 radio buttons which control a range of options. They are all set to show-hide (in Indesign) other buttons - call these 'Trigger buttons'. The trigger buttons have the layer visibility action linked to them in Acrobat. Then the trigger buttons are aligned so that they sit on top of each other making only one visible on screen.

That bit all works perfectly. I've tested it on the mac. No buttons show when printing. All interactive function works fine on Mac and PC.

Then my colleague on a pc tries to print it. Trigger buttons now print.

I've tried making the buttons non-printable in Indesign (both via Attributes pane and by 'deselecting' Printable in Buttons and Forms pane). I've selected them in Acrobat and made them 'Visible but non-printing'. Blasted things still print from the pc.

Any ideas? Am I missing a simple setting somewhere?

Really really hope someone has an answer. Thanks for looking!