R help - Mar 2008 - unlabeled tick mark interarrival

Hello list,

I am using R 2.4.1 on MacOSx. I've been exploring the seas package (0.3-5)
and am having a problem with plot.interarrival. I have modified the
example below by using width = "mon".  This works out well except for
the
tick mark labels on the x-axis.  The x-axis should be labeled from 1-12,
but the label for "11" is missing.


data(mscdata)
van.int <- interarrival(mksub(mscdata,id=1108447))
plot(van.int, ylog=FALSE, maxy=30, width = "mon")


Any ideas about why this happens? Thanks for the help.

Jeanne