If you try to use 2 modules you will get a white page or message saying that the function displayr() was redeclared.
So inside file
mod_flexitree_menu/tmpl/default.php
the function:
function displayr($level, $first, $link_cat)
...
}
must be inside an if, like this
if ( ! function_exists('displayr') ) {
function displayr($level, $first, $link_cat)
...
}
}
or the function should be moved to the helper file??