Steve Endow is playing with the web client and Troubleshooting GP Web Client Error: An unexpected error has occurred. Press the Sign-in button to reconnect to the application..
Dynamics GP Land: Troubleshooting GP Web Client Error: An unexpected error has occurred. Press the Sign-in button to reconnect to the application.
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.