[cliftonb]

When I try to open 2 specfic projects I get the following error. Anyone know a solution?

Unable to load world

Alice version: 2.3.5
os.name: Windows NT (unknown)
os.version: 6.2
os.arch: x86
java.vm.name: Java HotSpot(TM) Client VM
java.vm.version: 20.0-b11
user.dir: C:\Users\Doc\Desktop\Alice\Alice 2.3\Required

Throwable that caused the error:
java.lang.RuntimeException: NoSuchMethodException:class javax.vecmath.Matrix4d
	at edu.cmu.cs.stage3.alice.core.Property.getValueOf(Property.java:578)
	at edu.cmu.cs.stage3.alice.core.Property.decodeObject(Property.java:641)
	at edu.cmu.cs.stage3.alice.core.Property.decode(Property.java:656)
	at edu.cmu.cs.stage3.alice.core.Element.load(Element.java:1478)
	at edu.cmu.cs.stage3.alice.core.Element.load(Element.java:1495)
	at edu.cmu.cs.stage3.alice.core.Element.load(Element.java:1495)
	at edu.cmu.cs.stage3.alice.core.Element.load(Element.java:1543)
	at edu.cmu.cs.stage3.alice.authoringtool.dialog.LoadElementProgressPane.construct(LoadElementProgressPane.java:42)
	at edu.cmu.cs.stage3.progress.ProgressPane$2.run(ProgressPane.java:86)
	at java.lang.Thread.run(Thread.java:662)

Edit: Backups are hosed, too....