store arrangeGrob to object, does not create printable object

Question

I want to save, but not print (for now), a bunch of ggplot()s into a grid (via arrangeGrob(), correct?), then print and retrieve them late

Answer 1

The gridExtra package has been updated recently thereby changing how arrangeGrob works internally and what kind of object it returns (now a gtable).

You need to call grid.draw:

grid.draw(y)

Edit: do not use plot() as initially suggested; it will add a grey background, and is only meant to be used for debugging gtables.