Both owners/authors and invited readers of private blogs with Last Comments 1.3 installed who use the Mozilla Firefox browser may be experiencing an error with this recent comments gadget no matter what cookies they delete or how many times they revoke the gadget's access to the private comment feed. However, Mozilla Firefox users may be able to get Last Comments 1.3 to work with private blogs by turning on the browser option to "Accept third-party cookies".
To make sure that option is turned on, click on "Tools" in the menu bar of the Firefox browser, then select "Options" from the drop-down menu. In the new window that pops up, click on the "Privacy" tab with the picture of a mask above it. On that page of browser options, you will see the check-box that allows third-party cookies to be stored and retrieved by the Firefox browser: "Accept third-party cookies". Please make sure that box is checked.