I am experiencing a problem trying to use a method from the bigmemory.
 Specifically, I am using attach.big.matrix but the problem manifests when
trying to call attach.resource.  My environment is as follows:

> sessionInfo()
R version 2.10.1 (2009-12-14)
x86_64-pc-linux-gnu

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] bigmemory_4.2.3

loaded via a namespace (and not attached):
[1] tools_2.10.1


The generic function attach.resource has the following methods:

> showMethods("attach.resource")
Function: attach.resource (package bigmemory)
obj="big.matrix.descriptor"
obj="character"

I am trying to call the second version of the method with "character"
signature.

> attach.resource('my_big_matrix.desc')
Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "attach.resource", for
signature "list"

I would expect this to dispatch correctly as the class of the argument is
correct:

> class('my_big_matrix.desc')
[1] "character"

I suspect something may be wrong with my installation of R.  It is version
2.10.1 on Ubuntu 64bit.  Any help is appreciated.

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