Dynamics GP - An error has occurred in the script on this page, unspecified error

This occurs when the entire user folder is copied from a user with an old version of GP onto a new machine with a newer version of GP.

This error is also related to the missing drivers required for the metrics to work.
To get the metrics to work, download and install this on all clients.
http://www.microsoft.com/download/en/details.aspx?id=1878

OR, you can just disable the metrics by going to Customize, and unticking the metrics.