You must allow cookies to register for classes. Follow the instructions below for a few of the most popular browsers:
Internet Explorer: click Tools, then select "Internet Options". Click the Privacy tab, and then the "Advanced" button.
Check the "Override automatic cookie handling" checkbox, and if you choose to block First-party cookies, check the "Always allow session cookies" checkbox.
Mozilla Firefox: click Tools, then select "Options". Click the Privacy tab, and then check the "Accept cookies from sites" checkbox.
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