My Issue:
If my user session times out while an access restricted page is visible (say I left it open overnight), and the user then clicks on a button that performs an ajax call, the login required display appears within the div that the ajax update should happen in, rather than replacing the entire current page.
Potential Solutions:
Option 1) Extend the CWebUser and override the loginRequired() function to check for $request->isAjaxRequest (this would then need to redirect to a page which causes a javascript redirect)
Option 2) Modify the Site actionLogin to check the request type and render a different page which causes a javascript redirect.
Option 2 is the least invasive method, so I am going to go with that option and see how things work out ;)
Site Note: Could override the controller->redirect method, but I don't want to necessarily block all redirects -- I can forsee needing to have one ajax view action redirect to another ajax view action. If the controller override was used, it would have to be done on every controller - hardly efficient.