I am also having a similar issue to Aaricia. I have resolved the PHP errors with information from here - http://moodle.org/mod/forum/discuss.php?d=202273
But I am also not getting the expected content displayed on the student dashboard. Also I am able to create reports but unable to use them with the students in the test course.
Have 2.2 running with MySQL on IIS7. This is starting to become more urgent as 2.2 will be live for our users soon