Ah, yes, this is the issue where one of the functions we used is not longer supported in the latest version of PHP. In your CSSMenuWriter/cssmw_home/menu.php and CSSMenuWriter/cssmw_admin/menu.php replace the function split to be explode.
You can just do a search and replace on split with explode. There should be one call to the function in each file.
This should be fixed in the next release of the product.