Unable to Create Gallery Viewer

On start up the following error appears - 'Unable to Create Gallery Viewer' for pupils users who have restriction on what they can do on the PC's. Administrator users can run the program without the error. On a test PC I've given the pupils full access to the registry, and C:\ and removed all the station security settings but the error still occurs.
The detailed error is

Unable to create the gallery viewer




Alice version: 2.0 04/05/2005

os.name: Windows XP

os.version: 5.1

os.arch: x86

java.vm.name: Java HotSpot(TM) Client VM

java.vm.version: 1.3.1_10-b03

user.dir: C:\Program Files\Alice\Required



Throwable that caused the error:

java.lang.NullPointerException

at edu.cmu.cs.stage3.alice.authoringtool.galleryviewe r.GalleryViewer.<init>(GalleryViewer.java:1069)

at edu.cmu.cs.stage3.alice.authoringtool.editors.scen eeditor.CameraViewPanel.guiInit(CameraViewPanel.ja va:769)

at edu.cmu.cs.stage3.alice.authoringtool.editors.scen eeditor.CameraViewPanel.<init>(CameraViewPanel.jav a:744)

at edu.cmu.cs.stage3.alice.authoringtool.editors.scen eeditor.SceneEditor.<init>(SceneEditor.java:349)

at edu.cmu.cs.stage3.alice.authoringtool.JAliceFrame. guiInit(JAliceFrame.java:156)

at edu.cmu.cs.stage3.alice.authoringtool.JAliceFrame. <init>(JAliceFrame.java:71)

at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.mainInit(AuthoringTool.java:456)

at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.<init>(AuthoringTool.java:408)

at edu.cmu.cs.stage3.alice.authoringtool.JAlice.main( JAlice.java:123)

Thanks for any help....