I found these posts which talk about the same problem: https://stat.ethz.ch/pipermail/r-help/2009-April/194808.html I then tried temporarily disabling my Norton protection but it made no difference. :( -- View this message in context: http://r.789695.n4.nabble.com/problem-with-using-tm-tp2293581p2294917.html Sent from the R help mailing list archive at Nabble.com.