Hello, If you can get ctrl C to work then that is probably the best option. I don't think it would cause any harm to do that (but I might be wrong!). But I'm not sure ctrl C would work. And if it doesn't then a hard kill is probably the only option, which of course is not good because that would lose whatever work there was since the last save. (In the upcoming, v3, version of Analysis we are using Qt and we should be able to use multi-threading with that, to make this less of an issue. Also there should be fewer redraws in v3 so that will help. And the drawing is also faster, and that will help.) Wayne On Wed, 13 Jun 2012, Paul Schanda wrote: > Dear CCPN users, > > I am looking for a way to stop ccpn when it gets stuck in plotting > spectra. Particularly in 3D and 4D spectra, when looking at a too big > frequency range in the indirect dimensions and/or when the contour level > is set too low, the program tends to get stuck and tries to plot the > spectrum forever. Is there any elegant way of stopping it? Probably a > CTRL+C would do the affair, but I generally dislike this kind of killing > processes. > > Thanks > > Paul