IntelliJ IDEA (and other IntelliJ IDEA Platform based products such as RubyMine and Web IDE) may hang on Mac OS X when you access the screen menu. Thread dump shows the following:

"AWT-EventQueue-1 9.0#IU-92.35, eap:true"
     at apple.awt.CGlobalCursorManager.findHeavyweightUnderCursor(Native Method)
     at apple.awt.CGlobalCursorManager._updateCursor(CGlobalCursorManager.java:130)
     at apple.awt.CGlobalCursorManager.updateCursorImmediately(CGlobalCursorManager.java:75)
     at apple.awt.ComponentModel.updateCursorImmediately(ComponentModel.java:166)
     at java.awt.Component.updateCursorImmediately(Component.java:2919)
     at java.awt.Container.validate(Container.java:1488)
     at javax.swing.CellRendererPane.paintComponent(CellRendererPane.java:123)
     at javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:1503)
     at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1210)
     at javax.swing.plaf.ComponentUI.update(ComponentUI.java:155)
     at javax.swing.JComponent.paintComponent(JComponent.java:763)
     at com.intellij.ui.treeStructure.Tree.paintComponent(Tree.java:165)

This issue is reported as IDEA-26164 in our bug tracker. Unfortunately, it's a problem inside Apple Java implementation and we can't address it. There is similar problem report in the Apple Java mailing list for some other Java application.

A known workaround is to disable the screen menu by editing the Info.plist file as follows:

        <key>apple.laf.useScreenMenuBar</key>
        <string>false</string>