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If you were trying to access one of the tests, please click on this demonstration link. If this does not work, your browser may be misconfigured. Delete your cache and cookies and try again. Another approach is to try an alternative browser on your system, other than the one you are using. For example, internet explorer users can try the Firefox browser and vice versa. Or you can consider other browsers such as Safari or Opera.

A common error is not having Adobe Flash Player installed, or having a faulty version.



This Adobe support page may also be helpful in resolving problems.


If you started a study and were away from your computer for more than 15 minutes, the study times out and you may receive an error. If this is the case, you can try again.



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