EDIT

The user rights editor is available via Admin-UserGroups- select a user- right click menu- edit user rights.

When draging&dropping a classification the following error occurs.

No problem taxon nodes. So maybe we should simply use the root node instead of classification.

login : 
editor version : 4.8.2
server :  ()
schema version : 
os : Windows Server 2012 R2 6.3 amd64
java : 1.8.0_121
java.lang.NullPointerException
    at eu.etaxonomy.cdm.persistence.hibernate.permission.CdmPermissionClass.getValueOf(CdmPermissionClass.java:40)
    at eu.etaxonomy.cdm.persistence.hibernate.permission.CdmAuthority.<init>(CdmAuthority.java:82)
    at eu.etaxonomy.cdm.persistence.hibernate.permission.CdmPermissionEvaluator.authorityRequiredFor(CdmPermissionEvaluator.java:133)
    at eu.etaxonomy.cdm.persistence.hibernate.permission.CdmPermissionEvaluator.hasPermission(CdmPermissionEvaluator.java:106)
    at eu.etaxonomy.taxeditor.store.CdmStore.currentAuthentiationHasPermission(CdmStore.java:443)
    at eu.etaxonomy.taxeditor.navigation.navigator.TreeNodeDropAdapterAssistant.validateDrop(TreeNodeDropAdapterAssistant.java:123)
    at org.eclipse.ui.navigator.CommonDropAdapter$2.run(CommonDropAdapter.java:237)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.navigator.CommonDropAdapter.validateDrop(CommonDropAdapter.java:233)
    at org.eclipse.jface.viewers.ViewerDropAdapter.doDropValidation(ViewerDropAdapter.java:204)
    at org.eclipse.jface.viewers.ViewerDropAdapter.dragOver(ViewerDropAdapter.java:241)
    at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:81)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1103)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1088)
    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:802)
    at org.eclipse.swt.dnd.DropTarget.DragOver(DropTarget.java:380)
    at org.eclipse.swt.dnd.DropTarget.DragOver_64(DropTarget.java:352)
    at org.eclipse.swt.dnd.DropTarget$3.method4(DropTarget.java:260)
    at org.eclipse.swt.internal.ole.win32.COMObject.callback4(COMObject.java:101)
    at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
    at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:378)
    at org.eclipse.swt.dnd.DragSource.access$0(DragSource.java:304)
    at org.eclipse.swt.dnd.DragSource$1.handleEvent(DragSource.java:173)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4236)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3824)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
    at eu.etaxonomy.taxeditor.Application.start(Application.java:24)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1519)