Sidebar Login Plugin Not Showing Logged-in User Avatar + Member Access Issue

In a site using Wordpress 3.8 and Atahualpa 3.7.13, I'm encountering the same problem as described in previous forum thread: http://forum.bytesforall.com/showthread.php?t=20598.

Sidebar Login Plugin does not display the Logged-in User Avatar unless you refresh the page. Same on any page you had open in your Browser's cache before logging in. But, if you navigate to a new page after logging in, then the logged-in User Avatar displays.

In addition, with the Member Access plugin activated, if you login from a "Members only" restricted access page, the "Members Only" restricted access message continues to display, and it does not recognize you as logged in for any of the Members Only pages. (You continue to go only to the Members Access re-direct page with the "Sorry, Members Only" message.)

After trying to log in from a Members Only page, if you then log out and log back in from a public page, you are still denied access to all the Members Only pages. Only when you log out, clear the browser's cache, and then log back in from a public page (and refresh the page to display the logged-in user avatar), are you then permitted access to the Members Only pages.

Have tried de-activating other plugins, but no help.

Any help will be much appreciated!