I've tried the export/import from a fresh install of v8 as recommended and it now has the "UI personalization" and "Widget" applications working correctly :)
One final issue remaining - when adding widgets they don't display icons. To try and fix this I exported Development -> Widgets from the fresh install of v8 and tried importing them to my site. On import I was given the following error:
Error importing 'Widget categories' objects (Banner management)
UPDATE CMS_WidgetCategory SET [WidgetCategoryName] = @WidgetCategoryName, [WidgetCategoryDisplayName] = @WidgetCategoryDisplayName, [WidgetCategoryParentID] = @WidgetCategoryParentID, [WidgetCategoryPath] = @WidgetCategoryPath, [WidgetCategoryLevel] = @WidgetCategoryLevel, [WidgetCategoryOrder] = @WidgetCategoryOrder, [WidgetCategoryChildCount] = @WidgetCategoryChildCount, [WidgetCategoryWidgetChildCount] = @WidgetCategoryWidgetChildCount, [WidgetCategoryImagePath] = @WidgetCategoryImagePath, [WidgetCategoryGUID] = @WidgetCategoryGUID, [WidgetCategoryLastModified] = @WidgetCategoryLastModified WHERE [WidgetCategoryID] = @WidgetCategoryID
Invalid column name 'WidgetCategoryOrder'.
Is there a way to fix this?
Many thanks for your help.