Bug 127519 [Markers] Disabling all filters gives empty list
If you disable (uncheck) the 'Default' filter then the result seems to be that -everything- gets filtered. This seems most unintuitive...I'd think that if I don't have any filters enabled then I should see an 'unfiltered' list.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerAdapter.java
public MarkerList getCurrentMarkers() {
		if (lastMarkers == null) {
			view.scheduleMarkerUpdate(Util.SHORT_DELAY);
			building = true;
		}
		if (building) {
			return new MarkerList();
		}
		return lastMarkers;
	}
	/**
	 * Return the elements in the adapter.
	 * 
	 * @param root
	 * @return Object[]
	 */
	public Object[] getElements() {
		if (lastMarkers == null) {
			view.scheduleMarkerUpdate(Util.SHORT_DELAY);
			building = true;
		}
		if (building) {
			return Util.EMPTY_MARKER_ARRAY;
		}
		if (isShowingHierarchy() && categories != null) {
			return categories;
		}
		return lastMarkers.toArray();
	}
	/**