like i said it did not work in ff too. read my strike out text i gave a guess there:
* some browsers wont delete cookies until you close the tab or open a new tab.
* and most web servers will log you out once the client (browser) does not send cookies. so you will have to tell users to delete cookies, then open a new tab and paste the same URL
* I dont think you can do anything else as the cookies are sent by the browser and server wont know if they have been deleted from the browser jar or not.
* i guess the browser tab keeps a copy of the cookies even if they are removed from the main storage place -and only new tabs use that.
so just test your app your self in different browsers and you will know