After fixing the home_url() error, and activating the plugin, the whole WP back-end becomes unavailable. In the error log file I see:
[29-Jun-2011 23:22:01] PHP Warning: require_once(classes/WP_User_Search.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in /xxx/xxx/wp-content/plugins/wp-moneybookers-shortcodes/wp-moneybookers-shortcodes.php on line 33
Which is indeed the case. There is no such file... Creating an empty file with that name solves the error and gets me my admin area back but what can I expect to happen or fail after this?