are you using the advanced file manager?
if so, you will need to edit the plugin/kfm/configuration.php file.
there should be a line that looks like this:
$kfm_userfiles_address = '../../../../images/uploads';
change it to:
$kfm_userfiles_address = '../../../../';
and there should be another line that looks like:
$kfm_userfiles_output = 'images/uploads/';
change that one to:
$kfm_userfiles_output = '/';