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To reliably reproduce: 1. Make change in file (don't save), Quit NetBeans, Cancel in Save dialog. (2. Optionally save file outside of Save dialog, makes no difference.) 3. Quit NetBeans: nothing happens. Workaround: Save all files, use Force Quit. Environment (edited netbeans.conf because of problems with NetBeans 8.2 and Java 9): macOS 10.13.2 High Sierra [...]$ java -version java version "9.0.1" Java(TM) SE Runtime Environment (build 9.0.1+11) Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode) [...]$ grep netbeans_jdkhome /Applications/NetBeans/NetBeans\ 8.2.app/Contents/Resources/NetBeans/etc/netbeans.conf netbeans_jdkhome="/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home" [...]$