I just was able to reproduce it here, and see my error log:
[Sun Jan 13 12:42:29 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined function event_url() in /var/www/html/wordpress/wp-content/plugins/events-made-easy/eme_events.php on line 3537
==> the weird thing is that almost no differences are present between 1.0.5 and 1.0.6 … I need to check this. The function event_url() is present in the file eme_functions.php for quite some time already, so somehow eme_events.php stopped including this or so???