I'm using Acamas 1.0.2 in WordPress 3.0.5 running as multisite.
The problem with multisite is that any customization of the theme must be blog-specific -- otherwise, dropping in acamas-variant will affect all blogs which have the acamas theme selected. So the code can't look for acamas-variant/ in the shared wp-content/ directory.
As a workaround, since in my setup I always copy any theme that I want to customize for one blog (so that the untouched original theme is still available for other blogs to select), I chose to make the code look for acamas-variant/ inside the theme's directory itself.
So I changed acamas_variantcss() to have:
$variantcss_path = dirname( __FILE__ ) . '/acamas-variant/variant.css';
if (file_exists($variantcss_path)) { ?>
<!-- Custom CSS -->
<link rel="stylesheet" type="text/css" href="<?php echo dirname( get_bloginfo('stylesheet_url') ) ?>/acamas-variant/variant.css" />
<?php }By the way, in the original code for that function, I don't know the difference between checking for variantcss_path and variantcss_url: unless I can't read properly, the CSS link that is output is the same for both anyway. I don't know if that's intended or not.