Thanks for your answer and sorry for the late reply !
1. Sure I restarted Apache after the changes. I also tested by stopping httpd before making any change but this did not help !
2.I have not found any .htaccess file.
3.Nothing either in vhost configuration files !!
I tought I could adapt my scripts but this is not sufficient.
I had a working Freeradius server and I tryied to install phpmyprepaid yesterday. I mostly got error messages and my freeradius server only send REJECTS with same db as before now !!!
I saw most of phpmyprepaid files need to have short_tags enabled and I'm afraid it made some faulty changes in my Freeradius files !??? !
Great thanks for any help or tip.