After setting Nimbus as the default look and feel through swing.properties, the photo uploader in this site does not load. Java console shows NPE is thrown:

java.lang.NullPointerException
    at javax.swing.JSplitPane.setUIProperty(Unknown Source)
    at javax.swing.LookAndFeel.installProperty(Unknown Source)
    at javax.swing.plaf.basic.BasicSplitPaneUI.installDefaults(Unknown Source)
    at javax.swing.plaf.basic.BasicSplitPaneUI.installUI(Unknown Source)
    at javax.swing.JComponent.setUI(Unknown Source)
    at javax.swing.JSplitPane.setUI(Unknown Source)
    at com.fotki.panels.FileSystemPanel.setUpUI(FileSystemPanel.java:214)
    at com.fotki.panels.FileSystemPanel.<init>(FileSystemPanel.java:201)
    at com.fotki.base.BrowseScreen.<init>(BrowseScreen.java:71)
    at com.fotki.applet.FotkiUploader4.init(FotkiUploader4.java:239)
    at sun.applet.AppletPanel.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

To reproduce:
0. Set Nimbus as the default LAF
1. go to http://fotki.com
2. create an album
3. use the Java Photo Uploader
4. NPE thrown.

Environment: Vista, IE 7, FF 2 or 3, 6u10-b22 and nitely build (see comment).