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OK, I think I'm clear with all the pre-conditions now and all the recommendations you gave me. My default theme is on and is running. I made sure that I don't miss any files from phpGedView. I've clear the template_c folder, I've upgraded to XOOPS 2.0.13.1 etc.. etc..
So the result is ........ still doesn't work !!! BUT, now, when I click on the link to editconfig.php (I don't get a totaly blank page anymore) I get the XOOPS admin page environnement (the module list on the left, and the XOOPS admin menu bar on top) but the content is blank except this text " {pgvsplit} ".
I've put on the debugger and checked if there was anything wrong on this page, but no there isn't.
Any idea?