Line breaks in site name but not in title tag
Here is what I just found: There is no tags in the title, it's just a string. So the fix is quite simple.

in the html.tpl.php replace:

&lt;title&gt;&lt;?php print $head_title ?&gt;&lt;/title&gt;


With this:

&lt;title&gt;&lt;?php 
$break_tag = array("&amp;lt;br /&amp;gt;");
$simple_space = array(" ");
$new_head_title = str_replace($break_tag, $simple_space, $head_title);
print $new_head_title;
?&gt;&lt;/title&gt;


Hope it helps.