scudy nick wrote: Hi!
i am using joomsef and have problems to!
any idea about compatibility ?
I'm afraid your question does not include sufficient information to give an answer - it's like "My car doesn't drive, can you fix it?"
Anyway, personally I think you should consider to use the SEF built into Joomla 2.5.x/3.1.x. It does exactly the same thing using this instead of third party sef extensions prevents compatibility problems with other extensions.
In general, one of the first things you should think about when you use SEF urls and get a 404 error is to clear all cache. (Joomla itself / extensions / browser).
Another thing which comes into my mind after reading the first post in this thread is an incomplete Joomla multilanguage configuration, which I see quite often. The joomla language switcher relies on menu items. If you have more than one language on your site, EVERY menu item in the primary language need a counterpart in the other languages and every menu item needs the correct language tag assigned to it. If you miss one, the Joomla router (which builds the sef urls) will frequently fail.