Are you running 13.0 or 13.1? If it's 13.0 then download the service release. If that doesn't fix it, we would need to see the worksheet. This forum has ridiculously low upload limits, so save the file in compressed format. Either that, or post it over on this forum: http://collab.mathsoft.com/~mathcad2000 Which is the main forum anyway (this is a backwater, with relatively little traffic) Richard