X11cairo with antialias="none" buggy under MacOS?

using

X11(antialias="none")
plot(1:10)

produces an incomplete plot with 2.7.0. under
MacOS 10.4.11: both y-axes are missing.the
y-ticks (except the tick at `2' wich  is missing)
including labels are there.

this happens with  a 1280x854 labtop monitor.

is this known behaviour/a cairo bug?

joerg