Soeben das gleiche wieder gehabt. Gestern Abend Einstellungen an den Alarmparmeter Views gemacht, über Nacht laufen lassen. Gerade eben eigentlich nur neu gestartet um nach Updates gucken zu lassen, anschließend alles wieder weg.
Habe nen Log, in dem u.a. das hier steht (Bei Start AM)

!ENTRY org.eclipse.e4.ui.workbench 4 0 2013-03-09 10:57:41.501
!MESSAGE Unable to load resource file:/C:/Program%20Files/Alarmbearbeitung/AlarmMonitor%203.0/workspace/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi
!STACK 0
org.eclipse.emf.ecore.resource.impl.ResourceSetImp l$1DiagnosticWrappedException: org.eclipse.emf.ecore.xmi.IllegalValueException: Value 'org.eclipse.e4.ui.model.application.ui.basic.impl .PartStackImpl@58f904 (elementId: PartStack@15cde52, tags: null, contributorURI: null) (widget: null, renderer: null, toBeRendered: false, onTop: false, visible: true, containerData: null, accessibilityPhrase: null)' is not legal. (file:/C:/Program%20Files/Alarmbearbeitung/AlarmMonitor%203.0/workspace/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi, -1, -1)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImp l.handleDemandLoadException(ResourceSetImpl.java:3 19)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImp l.demandLoadHelper(ResourceSetImpl.java:278)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImp l.getResource(ResourceSetImpl.java:406)
at org.eclipse.e4.ui.internal.workbench.ResourceHandl er.loadResource(ResourceHandler.java:234)
at org.eclipse.e4.ui.internal.workbench.ResourceHandl er.loadMostRecentModel(ResourceHandler.java:202)
at org.eclipse.e4.ui.internal.workbench.swt.E4Applica tion.loadApplicationModel(E4Application.java:366)
at org.eclipse.e4.ui.internal.workbench.swt.E4Applica tion.createE4Workbench(E4Application.java:220)
at org.eclipse.ui.internal.Workbench$5.run(Workbench. java:557)
at org.eclipse.core.databinding.observable.Realm.runW ithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWork bench(Workbench.java:543)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Pl atformUI.java:149)
at de.alamos.monitor.application.Application.start(Ap plication.java:20)
at org.eclipse.equinox.internal.app.EclipseAppHandle. run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.runApplication(EclipseAppLauncher.java: 110)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework( Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.ja va:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:14 38)
Caused by: org.eclipse.emf.ecore.xmi.IllegalValueException: Value 'org.eclipse.e4.ui.model.application.ui.basic.impl .PartStackImpl@58f904 (elementId: PartStack@15cde52, tags: null, contributorURI: null) (widget: null, renderer: null, toBeRendered: false, onTop: false, visible: true, containerData: null, accessibilityPhrase: null)' is not legal. (file:/C:/Program%20Files/Alarmbearbeitung/AlarmMonitor%203.0/workspace/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi, -1, -1)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatu reValue(XMLHandler.java:2657)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFo rwardReferences(XMLHandler.java:1143)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.endDocum ent(XMLHandler.java:1222)
at com.sun.org.apache.xerces.internal.parsers.Abstrac tSAXParser.endDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumen tFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLPars er.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.Abstrac tSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserI mpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserI mpl.parse(Unknown Source)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XM LLoadImpl.java:175)
at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doL oad(XMLResourceImpl.java:240)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.l oad(ResourceImpl.java:1505)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.l oad(ResourceImpl.java:1284)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImp l.demandLoad(ResourceSetImpl.java:259)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImp l.demandLoadHelper(ResourceSetImpl.java:274)
... 22 more
Caused by: java.lang.IllegalArgumentException: The selected element org.eclipse.e4.ui.model.application.ui.basic.impl. PartStackImpl@58f904 (elementId: PartStack@15cde52, tags: null, contributorURI: null) (widget: null, renderer: null, toBeRendered: false, onTop: false, visible: true, containerData: null, accessibilityPhrase: null) must be visible in the UI presentation
at org.eclipse.e4.ui.model.application.ui.impl.Elemen tContainerImpl.setSelectedElement(ElementContainer Impl.java:164)
at org.eclipse.e4.ui.model.application.ui.impl.Elemen tContainerImpl.eSet(ElementContainerImpl.java:234)
at org.eclipse.e4.ui.model.application.ui.basic.impl. WindowImpl.eSet(WindowImpl.java:781)
at org.eclipse.e4.ui.model.application.ui.basic.impl. TrimmedWindowImpl.eSet(TrimmedWindowImpl.java:121)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSet(B asicEObjectImpl.java:1071)
at org.eclipse.emf.ecore.xmi.impl.XMLHelperImpl.setVa lue(XMLHelperImpl.java:1204)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatu reValue(XMLHandler.java:2652)
... 38 more