[R] prb with data.table

[yoda55]

R.2.11.1 on Windows 7

When running data.table examples.
> DT = data.table(x=rep(c("a","b","c"),each=3), y=c(1,3,6), v=1:9)
> setkey(DT,x)
> DT["a"]
I get the following error message
Erreur dans seq.default(to = xlen, length = n) :
  length must be non-negative number

When running the test.data.table(), pretty much all the tests fail (see
below)
Test 8 Error in seq.default(to = xlen, length = n) :
  length must be non-negative number
Test 9 Error in seq.default(to = xlen, length = n) :
  length must be non-negative number
.....

Any help appreciated   

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