R help - Nov 2007 - Error running OC package - program ending

I am attempting to run Poole's OC package in R, using Windows NT 5.1. 
Everytime I try to estimate a two-dimensional model, the estimation begins
and then I am informed "R for Windows GUI front-end has encountered a
problem and needs to close".  There is no problem estimating a
one-dimensional model.  I have no idea why the estimation will not contine. 
I have included the error signature below.
Any help or suggestions would be appreciated.

Error Signature:
AppName: rgui.exe	 AppVer: 2.60.43063.0	 ModName: ntdll.dll
ModVer: 5.1.2600.2180	 Offset: 00011e58
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Please contact the package maintainer with a reproducible example (as the 
posting guide asked you to).

On Fri, 9 Nov 2007, Stu Bioge wrote:
>
> I am attempting to run Poole's OC package in R, using Windows NT 5.1.
> Everytime I try to estimate a two-dimensional model, the estimation begins
> and then I am informed "R for Windows GUI front-end has encountered a
> problem and needs to close".  There is no problem estimating a
> one-dimensional model.  I have no idea why the estimation will not contine.
> I have included the error signature below.
> Any help or suggestions would be appreciated.
>
> Error Signature:
> AppName: rgui.exe	 AppVer: 2.60.43063.0	 ModName: ntdll.dll
> ModVer: 5.1.2600.2180	 Offset: 00011e58
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595