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[dev-200501191900, JDK 1.5.0_02] Sometimes happens to me that after changing project properties and running build of the project I got message "Platform is not correctly setup". Until I open proj props again and hit OK I cannot build the project. Cannot tell for sure what's the cause, marking as RANDOM and setting prio to P3. If I knew cause it'd be P2 at least.
I am not able to reproduce it, but since it is a RANDOM issue I am letting it open for a while. If you are able to reproduce it, please attach the project files before you opened the customizer.
It was probably related to wrong lazy initialization of platform combo box model. Which was fixed: http://java.netbeans.org/source/browse/java/j2seproject/src/org/netbeans/modules/java/j2seproject/ui/customizer/PlatformUiSupport.java.diff?r1=1.2&r2=1.3
Closing, I will file new issue when happen again.