Steps to reproduce:
1. Start NetBeans IDE 8.0.2
2. In Java Platform Manager, select jdk1.8.0_51 as and make it the default.
3. Create a new JavaFX project. Verify that it is using JDK_1.8, and run it.
4. Exit the IDE.
5. Start NetBeans IDE Dev 20150824 (or later), preferable installed on jdk1.8.0_51 
6. In Java Platform Manager, ensure that jdk1.8.0_51 is the default JDK_1.8.
7. Open the project you had created in step 3. 
8. The system reports "... Build script updated", and the "Project Problem" dialog appears. See screen shots.