We are intending to include a lot more pre-computed information with an installed package in 2.0.0, and to force all packages to be reinstalled under 2.0.0. This causes a problem with R-devel pre-2.0.0, which stamps packages as having been installed under the future 2.0.0. As of today we have changed the format of the meta-information file 'Meta/package.rds', and you should either reinstall packages under R-devel (a good idea if they were not installed in August) or run tools:::.update_package_rds() (it has a lib.loc argument, so can be run a library at a time). Even the standard and recommended packages need to be updated unless you are building from scratch.
Brian D. Ripley, ripley@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