Try the following setting:

 

<add name="CEHtmlEditorProvider"
        type="DotNetNuke.HtmlEditor.CEHtmlEditorProvider, DotNetNuke.CEHtmlEditorProvider"
        providerPath="~\Providers\HtmlEditorProviders\CEHtmlEditorProvider\CuteSoft_Client\CuteEditor\"
        UseDNNRootImageDirectory="true"
        RemoveServerNamesFromUrl="true"
        UseRelativeLinks="true"
     RenderRichDropDown="true"
     UseSimpleAmpersand="false"
     CustomCulture=""
     ThemeType="Office2003_BlueTheme"
     DisableAutoFormatting="false"
     BreakElement="br"
     EditorWysiwygModeCss="1.css"
     EditorBodyStyle=""
     Admin_AutoConfigure = "Full"
     Admin_SecurityPolicyFile = "admin.config"
     Admin_TemplateItemList = ""
     Admin_DisableItemList = ""
     Admin_AllowPasteHtml  ="true"
     Admin_EditorOnPaste  = "default"
     Admin_ReadOnly = "false"
     Admin_ShowBottomBar ="true"
     Admin_ShowHtmlMode  ="true"
     Admin_ShowPreviewMode  ="true"
     Admin_EnableStripScriptTags  ="false" 
     Admin_EnableContextMenu    = "true"
     Admin_EnableContextMenuEditing  = "true"  
     Admin_EnableContextMenuFormat   = "true"
     Admin_EnableContextMenuInsert  = "true"
     Admin_EnableContextMenuInsertAdvanced  = "true"
     Admin_EnableContextMenuInsertFiles = "true"
     Admin_EnableContextMenuInsertForms = "true"
     Admin_EnableContextMenuRelative = "true"
     Admin_EnableContextMenuTags = "true"
     Admin_EnableContextMenuVerbs = "true"          
     
     Registered_AutoConfigure = "Simple"
     Registered_SecurityPolicyFile = "default.config"
     Registered_TemplateItemList = ""
     Registered_DisableItemList = ""
     Registered_AllowPasteHtml  ="true"
     Registered_EditorOnPaste  = "default"
     Registered_ReadOnly = "false"
     Registered_ShowBottomBar ="true"
     Registered_ShowHtmlMode  ="true"
     Registered_ShowPreviewMode  ="true"
     Registered_EnableStripScriptTags  ="false" 
     Registered_EnableContextMenu    ="true" 
     Registered_EnableContextMenuEditing  = "true"  
     Registered_EnableContextMenuFormat   = "true"
     Registered_EnableContextMenuInsert  = "true"
     Registered_EnableContextMenuInsertAdvanced  = "true"
     Registered_EnableContextMenuInsertFiles = "true"
     Registered_EnableContextMenuInsertForms = "true"
     Registered_EnableContextMenuRelative = "true"
     Registered_EnableContextMenuTags = "true"
     Registered_EnableContextMenuVerbs = "true"   
     
     Guest_AutoConfigure = "Simple"
     Guest_SecurityPolicyFile = "default.config"
     Guest_TemplateItemList = ""
     Guest_DisableItemList = ""
     Guest_AllowPasteHtml  ="true"
     Guest_EditorOnPaste  = "default"
     Guest_ReadOnly = "false"
     Guest_ShowBottomBar ="true"
     Guest_ShowHtmlMode  ="true"
     Guest_ShowPreviewMode  ="true"
     Guest_EnableStripScriptTags  ="false" 
     Guest_EnableContextMenu    ="true"  
     Guest_EnableContextMenuEditing  = "true"  
     Guest_EnableContextMenuFormat   = "true"
     Guest_EnableContextMenuInsert  = "true"
     Guest_EnableContextMenuInsertAdvanced  = "true"
     Guest_EnableContextMenuInsertFiles = "true"
     Guest_EnableContextMenuInsertForms = "true"
     Guest_EnableContextMenuRelative = "true"
     Guest_EnableContextMenuTags = "true"
     Guest_EnableContextMenuVerbs = "true"  
     
     Test_AutoConfigure = "Simple"
     Test_SecurityPolicyFile = "default.config"
     Test_TemplateItemList = ""
     Test_DisableItemList = ""
     Test_AllowPasteHtml  ="true"
     Test_EditorOnPaste  = "default"
     Test_ReadOnly = "false"
     Test_ShowBottomBar ="true"
     Test_ShowHtmlMode  ="true"
     Test_ShowPreviewMode  ="true"
     Test_EnableStripScriptTags  ="false" 
     Test_EnableContextMenu    ="true"  
     Test_EnableContextMenuEditing  = "true"  
     Test_EnableContextMenuFormat   = "true"
     Test_EnableContextMenuInsert  = "true"
     Test_EnableContextMenuInsertAdvanced  = "true"
     Test_EnableContextMenuInsertFiles = "true"
     Test_EnableContextMenuInsertForms = "true"
     Test_EnableContextMenuRelative = "true"
     Test_EnableContextMenuTags = "true"
     Test_EnableContextMenuVerbs = "true"        

     Content_Managers_AutoConfigure = "Simple"
     Content_Managers_SecurityPolicyFile = "default.config"
     Content_Managers_TemplateItemList = ""
     Content_Managers_DisableItemList = ""
     Content_Managers_AllowPasteHtml  ="true"
     Content_Managers_EditorOnPaste  = "default"
     Content_Managers_ReadOnly = "false"
     Content_Managers_ShowBottomBar ="true"
     Content_Managers_ShowHtmlMode  ="true"
     Content_Managers_ShowPreviewMode  ="true"
     Content_Managers_EnableStripScriptTags  ="false" 
     Content_Managers_EnableContextMenu    ="true"  
     Content_Managers_EnableContextMenuEditing  = "true"  
     Content_Managers_EnableContextMenuFormat   = "true"
     Content_Managers_EnableContextMenuInsert  = "true"
     Content_Managers_EnableContextMenuInsertAdvanced  = "true"
     Content_Managers_EnableContextMenuInsertFiles = "true"
     Content_Managers_EnableContextMenuInsertForms = "true"
     Content_Managers_EnableContextMenuRelative = "true"
     Content_Managers_EnableContextMenuTags = "true"
     Content_Managers_EnableContextMenuVerbs = "true"   
        />

 

Also please check your DotNetNuke.CEHtmlEditorProvider.dll, the version # should be 1.0.2082.18766.