In a newly downloaded version (today) of R-2-4-0alpha, with all packages
from CRAN also installed today, I get:

> library(Matrix)
Erro en loadNamespace(package, c(which.lib.loc, lib.loc), keep.source =
keep.source) :
        in 'Matrix' methods specified for export, but none defined: BIC,
anova, coef, confint, deviance, fitted, fixef, formula, head, lmer, logLik,
mcmcsamp, plot, qqmath, ranef, residuals, resid, simulate, summary, tail,
terms, update, vcov, VarCorr, with, cbind2, rbind2, Arith, Math, Math2,
Summary, Compare, !, +, %*%, Schur, as.array, as.matrix, as.vector, band,
chol, colMeans, colSums, coerce, crossprod, determinant, diag, dim,
dimnames, dimnames<-, expand, expm, kronecker, image, isSymmetric, norm,
rcond, rowMeans, rowSums, show, solve, t, tcrossprod, tril, triu
Error: package/namespace load failed for 'Matrix'
> sessionInfo()
R version 2.4.0 alpha (2006-09-05 r39134)
i386-pc-mingw32

locale:
LC_COLLATE=Spanish_Chile.1252;LC_CTYPE=Spanish_Chile.1252;LC_MONETARY=Spanish_Chile.1252;LC_NUMERIC=C;LC_TIME=Spanish_Chile.1252

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

other attached packages:
  lattice
"0.13-10"


Kjetil

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