Enrolment

Hi,

I am building a new Moodle server and I have everthing working okay, I can authenticate and enrol against 4 MS AD servers, I am creating the groups that autoenrolment needs to create courses, however when I log in as a new user and Moodle checks the for courses to create the browser hangs for a few seconds and then I get a blank page (Done in the bottom left) I hit F5 for refresh and then the student gets logged in to the correct course, if I log in as a student who is enrolled in 4 or 5 courses then I have to refresh the page once for each course before I can even get logged in, once I get logged in everything is as you would expect, is anyone else experiencing this? Students are not going to know to refresh the page if they have been added to a new course thru the AD. Any help is greatly appricated,

Windows XP pro, Apache (latest) Moodle 1.7 (just testing)
Thanks
Rob.