First thank you for all your suggestion.
More detail can be given to the caes
1. For the case of the problem happened, the user_id is equal to 0, ie. not-login user. I have no idea if login user would have the problem. But not login user has problem and I am trying to narrow down the case first.
So I guess moving util_memoize_flush may not help the case.
2. The problem happened in both Firefox and IE. And I found that I can change the cookie ad_locale correct but the expiry time is infinte. I have two other cookies that one is session_id with 2 hour life time and one is ad_user_login with infinte lifetime.
Or should I disable memoize cache?
Thank you.
Kevin
