You can filter out node types from your graph in the Hypershade work area, as well as from the Hypershade browser. Nodes that do not appear may have been filtered out.
To check your filter settings in the work area, right-click and select Show > Objects from the marking menu.
To check your filter settings in the browser, click the Show button and select Objects. See Hypershade Browser toolbar for more information.
To clear all your filters, select Clear Below. Verify also that you have not entered any text in the filter text box. The filter text box is located in the respective toolbar of the work area and the browser.