i even tried a new build of retroarch , which seemed to work initially then when I changed settings in one core it carried over into them all !!
the configs from old build seemed to have populated via Notepad ++ into new build , is that possible ??
the new build has now corrupted so I cannot change shaders again
is it worth trying again but first deleting notepad ++
its really bugging why it keeps doing this I even tried transferring everything to a different HDD in case that was the cause no change !
Thanks Dean