How to do the Cookie Dance:
First , click below to get this:
Auto Cookies MOD
then, unzip it to your computer,
then upload the included install folder to your phpbb folder on the server.
then , in your browser, go to:
then in the suggested settings section, change the cookie name.
It doesn't matter what you change it to.
then click the button to accept the settings it finds.
then delete the install folder.
then log out of your board
then close your browser
then go back and log in again and test.
If this does not solve your problem, then run it again and copy and paste the pre
bbcoded suggested and current settings into a post here so we can see them.