Gradebook shortcuts are not recommended.Keep in mind whenever you go to do grades using a shortcut you are directed to one server which can result in an error message.
Going to gradebook from SMS- always takes you to the server with the least amount of traffic.
If you can log into gradebook but only see it on your task bar but for some reason its not opening. Follow the steps below
You can click the windows key(it looks like 4 squares), +shift,+ the left or right arrow and it should appear. Something students services is aware of. If you need help let me know prior to grades being due and I can assist you.