Some calibrators are more accurate with certain screens, and others are more accurate with other screens.

I doubt it's the Spyder .. but it could be the Spyder software!!

As to why the prints are all out in one hue is a mystery, but as long as you've specified the right files and types and colourmode, it's really more in Mic's court than the printers.. unless the printer has swapped out paper stock and not used an appropriate colour profile for it and so on.


Other thing I can suggest is your ambient lighting.

Because the screen is lit up, the type of ambient lighting is going to affect the print more with it's particular colour rendering, whereas the screen even tho it's also affected by the ambient light type, it is less so because it's light source is partly compensating for the room light anyhow.

Have you tried alternate light sources in the room?

I'm assuming you're using a CFL type of lighting arrangement, do you have a quartz halogen type light source to try temporarily too?

You can get 6500K CFL lights and they are a very harsh bright white colour, as opposed the the more popular warm toned CFL lights .. which I now can't stand.
The difference in the room once the 6500K CFL was fitted is amazing. All my family comment how it hurts their eye's and it's too harsh and white and so on.. but of course they don't see like wee see.
(eg. I watch the nightly news and can't help but notice the purple fringing in the video footage when under bright harsh sunlight conditions.. everyone else thinks I need glasses!)

Problem is at the moment is that it seems as though you can't physically take the prints back to the printers to see them under their lighting conditions and compared to the digitial files on their screens???

If you don't already have one, try a specialist lighting shop, look for a CFL with a colour temp of 6500K, even better, try to find one that has a CRI index of more than 91%(highly unlikely!!) You probably don't have fluoro lighting in your PC room, but if you did, there are some fluoro lights that also have a high CRI rating.
CRI.. higher = better.

To put this into perspective: imagine if your room ambient lighting was sourced by the setting sun. No matter how white the curtains were, the room will always have a strong yellow cast to it. That's just the nature of ambient lighting. Your print will look warmer/yellower, because it's reflecting light(prints don't transmit light), whereas the PC screen will still look quite yellow to you, you just don't notice it, because the screens lighting is overpowering the ambient light in the room.

The ambient lighting conditions is important for viewing the print ... not so much the screen.