Dear Isogeochemists: Over the past week during autocarb runs on an Optima mass spec using software v.2.33 we've been experiencing random software shutdowns. Trying to reopen the software gives the error message "System controller not responding". We can reset the controller and open the software and start a run again but have yet to make it through a run without this problem occuring. It does not seem to be occuring at a particular port # or process. Has anyone experienced this problem and can you offer any solutions? Thanks for your help, Mary Mary Hogan University California Santa Cruz Stable Isotope Laboratory, E&MS C514 Santa Cruz, CA USA 95064 email: [log in to unmask] PH: 831-459-5751 FAX: 831-459-3074 __o -\<, (_)/(_)