[R] plot.hclust point to older version

[Michael Mason]

Hello fellow R users,

I have recently updated to R 3.1.2. When trying to plot an hclust object to generate the dendrogram I get the following error:

Error in .Internal(dend.window(n, merge, height2, hang, labels, ...)) :
  there is no .Internal function 'dend.window'


I am indeed using R3.1.2 but my understanding is that the .Internal API to the C code is no longer used. I have tried detaching the stats package and restarting R to no avail.
I would love any help from any wiser guRus.
Thanks in advance,
Mike
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