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Cut and paste don't work....downloaded with macports, running on mountain lion under Xquartz
This seems to be a problem with the port for MacOS X. Xournal uses standard GTK clipboard features, so I am not sure whether the problem is with the GTK library in Macports or anything else. Since I don't have a Mac and the problem doesn't occur on other platforms, I don't think I can do anything about it...
I'd file this as a bug against the Macports port of Xournal and/or the Macports version of GTK-2; not sure what else to suggest.