Hi, I need a sanity check. When I try the following: library(R.oo) setConstructorS3( "QREobject", abstract=TRUE, function(...) { extend( Object(), "QREobject" ); } ); I get: Error in names(args) : no applicable method for "names" Things were working fine in R 2.4.1 I wonder if it has to do with this release note for R 2.5.0: o levels<-(), names() and names<-() now dispatch internally for efficiency and so no longer have S3 default methods. from here: https://stat.ethz.ch/pipermail/r-announce/2007/000828.html I'm wondering if I have done something wrong or is there an incompatibility issue. If it's the latter, I hope Mr. Henrik Bengtsson would be nice enough to update the software. I'm so dependent on R.oo that I will roll back to 2.4.1 until there's a workaround for this. Anyone else having similar issues? Thanks in advance. - Ken