Hello!

When joomsef is on some of my pages randomly gets 404, some times some works at other times other don't work, and its all seems a bit strange. Its never the same pages, its totally randomly, and some times it helps to purge and empty the cache.

Im using the latest version of Jomsef with Joomla 1.6.3 .

Hope some one can help me with this asap.

Hello,
based on your description it is almost impossible to help.
"sometimes" and "random" are not the best terms in IT. :-)

Please, at the moment when this occurs, take a record of the URL and its non-SEF equivalent. Anyway, if it works just with another reload, then I would recommend you to turn cache off, at least temporarily and check if it helps.