Hi, When I type library(cem), cem appears to load, but I am, unable to execute any commands in R afterwards. I've pasted in the commands I've used and what R has printed in the log. It seems like there's an error, but I don't understand what's going on. (I've gotten this rrot on my Mac Pro with 20GB ram and my macbook air.) Any help greatly appreciated. Thanks, Bill [R.app GUI 1.40 (5751) x86_64-apple-darwin9.8.0] [History restored from /Users/undefined/.Rapp.history] Loading required package: nlme Loading required package: lattice Loading required package: randomForest randomForest 4.6-2 Type rfNews() to see new features/changes/bug fixes. Loading required package: tcltk Loading Tcl/Tk interface ... *** caught segfault *** address 0x1000080, cause 'memory not mapped' Traceback: 1: sys.parent() 2: sys.function(sys.parent()) 3: formals(sys.function(sys.parent())) 4: match.arg(encoding) 5: match(match.arg(encoding), c("", "bytes", "UTF-8")) 6: textConnection("rval", "w", local = TRUE) 7: capture.output(print(args(load))) 8: paste(capture.output(print(args(load))), collapse = "") 9: gsub("\\s+", " ", paste(capture.output(print(args(load))), collapse = "")) 10: doTryCatch(return(expr), name, parentenv, handler) 11: tryCatchOne(expr, names, parentenv, handlers[[1L]]) 12: tryCatchList(expr, classes, parentenv, handlers) 13: tryCatch(expr, error = function(e) { call <- conditionCall (e) if (!is.null(call)) { if (identical(call[[1L]], quote (doTryCatch))) call <- sys.call(-4L) dcall <- deparse(call)[1L] prefix <- paste("Error in", dcall, ": ") LONG <- 75L msg <- conditionMessage(e) sm <- strsplit(msg, "\n")[[1L]] w <- 14L + nchar(dcall, type = "w") + nchar(sm[1L], type = "w") if (is.na(w)) w <- 14L + nchar(dcall, type = "b") + nchar(sm[1L], type = "b") if (w > LONG) prefix <- paste (prefix, "\n ", sep = "") } else prefix <- "Error : " msg <- paste(prefix, conditionMessage(e), "\n", sep = "") .Internal (seterrmessage(msg[1L])) if (!silent && identical(getOption ("show.error.messages"), TRUE)) { cat(msg, file = stderr()) .Internal(printDeferredWarnings()) } invisible(structure(msg, class = "try-error"))}) 14: try(gsub("\\s+", " ", paste(capture.output(print(args (load))), collapse = "")), silent = TRUE) Possible actions: 1: abort (with core dump, if enabled) 2: normal R exit 3: exit R without saving workspace 4: exit R saving workspace Selection: