The navigateToRelatedList method stopped working recently for some reason.  I've tested this out in multiple orgs and every time, I get the same "An internal error has occured" error message.
 

<a href="#" onclick="navToList()">Navigate to related list</a>
<script>
    var navToList = function() {
        sforce.one.navigateToRelatedList('RelatedContactList', '001F0000017mcntIAA');
    };
</script>

This is a simplified example, but it should work.  I tried both the 15 and 18 character versions of the account id.  I had some code that actually worked fine for a while but later stopped working, probably after the most recent release.  Any ideas why this would not work?  Any help is much appreciated.  Thanks!