[R] update R 2.11.0，there is error when using plot(), how can I do?

[bbslover]

> a<-1:5
> b<-2:6
> plot(a,b)
Error in function (width, height, pointsize, record, rescale, xpinch,  : 
  Graphics API version mismatch


before, R 2.10  , plot() is ok.   Now, R 2.11.0 does not work
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