You didn't mention on R-help that the bug was already fixed in 2.7.0 patched, otherwise I wouldn't have bothered with a bug report. -- Gad Abraham Dept. CSSE and NICTA The University of Melbourne Parkville 3010, Victoria, Australia email: gabraham at csse.unimelb.edu.au web: http://www.csse.unimelb.edu.au/~gabraham