User profile link not working

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Urgent and critical. My site is hosted at http://www.studentclubb.com when you login and click on any user profile, the page loads forever and then shows a connection error. I’ve done everything I could but to no avail. Please help.. it’s urgent.

Also, how can I change the profile link name to show username instead of Full Name as it shows on the menu when you login? Please help!

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