Enrolment

When I create new course in moodle, in database in column enrol strange values appear ("/" ,"/D", "^U" ...).

And when I go to the category where this course was created I get something like this:  /var/www/html/electurer/wship/enrol/ //enrol.php does not exist

When I make sql:
UPDATE mdl_course SET enrol="";
Everything is working ok, but I think this is not a good way to solve this problem.

I use moodle 1.6.2+ on fc5 linux apache2> mysql5> php5>