Product Version: NetBeans IDE Dev (Build 201110020601)
Java: 1.7.0; Java HotSpot(TM) 64-Bit Server VM 21.0-b17
System: Windows 7 version 6.1 running on amd64; Cp1252; en_US (nb)
When setting a Preloader to a FX Project using "Choose Preloader from Project" option, if valid preloader project which isn't currently opened in the IDE is chosen, only <No Preloader Class Available> message is shown in the "Preloader Class" field. If the preloader project is opened in the IDE, then the "Preloader Class" field is filled and Preloader can be set.
Anomaly still exists - tested tonight using:
Product Version: NetBeans IDE Dev (Build 201309040001)
Java: 1.7.0_25; Java HotSpot(TM) 64-Bit Server VM 23.25-b01
Runtime: Java(TM) SE Runtime Environment 1.7.0_25-b15
System: Linux version 2.6.32-300.3.1.el6uek.x86_64 running on amd64; UTF-8; en_US (nb)
I would, however, note that once the preloader is selected (using the open preloader project) into the main project, the preloader project can be closed, and the main project can be cleaned, built, and run just fine.