R help - Jan 2009 - error using heatmap :"evaluation nested too deeply....."

Hi,
I get following error when trying to plot a heatmap on a very large matrix
(808 x5000).

heatmap(ctab)
Error: evaluation nested too deeply: infinite recursion /
options(expressions=)?



 Call to heatmap function is not contained within any other function or so.
Upon searching the R mailing list, I found that someone had the same problem
and the suggested solution was to set an option using options(expressions 500).

I tried it but even on small subset of the matrix, but it continues  giving
the  same error.  I use default distance matrix with row scaling.



Please help.

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