Joomla 1.5: Joomfish and default language Problem

Sometimes, you choose the default language “Arabic” from the backend and when you go to frontend, the site language still “English” not “Arabic”????!?!?!?!??!?!?1
Here is the solution:
go to Plugin Manger
1)System – Jfrouter : set “Language selection for new visitors?” to “site default language” value.
2)System – Jfrouter : disable “Save user language in a cookie”.
Note: If you are using T3 framework, enable “Save user language in a cookie”
3)deleted cookies of the browser

it works fine already.