Few actions were made before IDE stops responding:
1. mounted file systems
2. created new packages
3. new classes and forms created
When look and feel was changed IDE eats 99% of CPU forever.

Full thread dump:

"Compilation" daemon prio=2 tid=0x98c100 nid=0x74 waiting on monitor [0x15d5f000..0x15d5fdf0]
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:424)
        at com.netbeans.developer.impl.compiler.CompilationEngineImpl$CompilerThread.nextJobAndTask(CompilationEngineImp
l.java:148)
        at com.netbeans.developer.impl.compiler.CompilationEngineImpl$CompilerThread.run(CompilationEngineImpl.java:164)


"visdoc" prio=5 tid=0x973c70 nid=0x94 waiting on monitor [0x1583f000..0x1583fdf0]
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:424)
        at ice.iblite.VisDocument.run(ice/iblite/VisDocument)
        at java.lang.Thread.run(Thread.java:479)


"parser" prio=4 tid=0x972610 nid=0xaa runnable [0x1573f000..0x1573fdf0]
        at java.lang.Object.wait(Native Method)
        at ice.iblite.Parser.run(ice/iblite/Parser)
        at java.lang.Thread.run(Thread.java:479)

"Thread-4" prio=5 tid=0x8faef0 nid=0xa0 waiting on monitor [0..0x12fd90]

"TimerQueue" daemon prio=5 tid=0x8eb390 nid=0x82 runnable [0x138af000..0x138afdf0]
        at java.lang.Object.wait(Native Method)
        at javax.swing.TimerQueue.postExpiredTimers(TimerQueue.java:219)
        at javax.swing.TimerQueue.run(TimerQueue.java:234)
        at java.lang.Thread.run(Thread.java:479)

"OpenFile" prio=5 tid=0x8e2b60 nid=0xcc runnable [0x1339f000..0x1339fdf0]
        at java.net.PlainDatagramSocketImpl.peek(Native Method)
        at java.net.DatagramSocket.receive(DatagramSocket.java:354)
        at com.netbeans.developer.modules.openfile.Server.server(Server.java:109)
        at com.netbeans.developer.modules.openfile.Server.run(Server.java:61)
        at java.lang.Thread.run(T