EDIT

while editing media of a taxon in bulkeditor the following exception appears:

last remote method : http://localhost:52913/remoting/common.service
last remote request client time : 2020-07-09T22:57:15.94
last remote request response header time : Thu, 9 Jul 2020 22:57:15 +0200
client error time : 2020-07-09T22:57:56.004
login : admin
editor version : 5.17.0.202007081029
server : localhost (localhost mgd.) / Cyprus production
schema version : 5.15.2.0.20200611
os : Windows Server 2012 R2 6.3 amd64
java : 1.8.0_121
java.lang.ClassCastException: eu.etaxonomy.cdm.model.media.Media cannot be cast to eu.etaxonomy.cdm.model.taxon.TaxonBase
                at eu.etaxonomy.taxeditor.bulkeditor.input.TaxonEditorInput.addSaveCandidate(TaxonEditorInput.java:1)
                at eu.etaxonomy.taxeditor.bulkeditor.e4.BulkEditorE4.changed(BulkEditorE4.java:264)
                at eu.etaxonomy.taxeditor.view.e4.AbstractCdmEditorPartE4.changed(AbstractCdmEditorPartE4.java:188)
                at eu.etaxonomy.taxeditor.editor.view.media.e4.MediaViewPartE4.changed(MediaViewPartE4.java:130)
                at eu.etaxonomy.taxeditor.view.e4.AbstractCdmEditorPartE4.changed(AbstractCdmEditorPartE4.java:188)
                at eu.etaxonomy.taxeditor.view.e4.AbstractCdmDataViewerE4.markViewPartDirty(AbstractCdmDataViewerE4.java:110)
                at eu.etaxonomy.taxeditor.view.e4.details.DetailsViewerE4.markViewPartDirty(DetailsViewerE4.java:222)
                at eu.etaxonomy.taxeditor.view.e4.AbstractCdmDataViewerE4$1.dirtyStateChanged(AbstractCdmDataViewerE4.java:80)
                at org.eclipse.ui.forms.AbstractFormPart.markDirty(AbstractFormPart.java:93)
                at eu.etaxonomy.taxeditor.view.detail.CdmSectionPart.propertyChange(CdmSectionPart.java:209)
                at eu.etaxonomy.taxeditor.ui.element.AbstractCdmFormElement.firePropertyChangeEvent(AbstractCdmFormElement.java:255)
                at eu.etaxonomy.taxeditor.ui.element.TextWithLabelElement.modifyText(TextWithLabelElement.java:178)
                at eu.etaxonomy.taxeditor.ui.element.LanguageStringWithLabelElement.modifyText(LanguageStringWithLabelElement.java:93)
                at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:180)
                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:1084)
                at org.eclipse.swt.widgets.Text.wmCommandChild(Text.java:3122)
                at org.eclipse.swt.widgets.Control.WM_COMMAND(Control.java:4947)
                at org.eclipse.swt.widgets.Control.windowProc(Control.java:4802)
                at org.eclipse.swt.widgets.Display.windowProc(Display.java:5123)
                at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
                at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2446)
                at org.eclipse.swt.widgets.Text.callWindowProc(Text.java:262)
                at org.eclipse.swt.widgets.Control.windowProc(Control.java:4897)
                at org.eclipse.swt.widgets.Text.windowProc(Text.java:2704)
                at org.eclipse.swt.widgets.Display.windowProc(Display.java:5110)
                at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
                at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2552)
                at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3822)
                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:20)
                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)