The problem appears to be either in GA_Filter::ga_parse_link or the regular expression that is passed on line 1220 of googleanalytics.php:
static $anchorPattern = '/<a (.*?)href=[\'\"](.*?)\/\/([^\'\"]+?)[\'\"](.*?)>(.*?)<\/a>/i';
What ends up happening is that a URL that looks like this:
will have the Google Analytics plugin turn it into the following:
Any chance we can see a fix for this?