I click on a SLURL in my email program, http://maps.secondlife.com/secondlife/Maryport/42/21/2603
Usually I get a web page with a map of the grid and the option to Teleport or Join.
Currently I get a dialog:
We are unable to locate the region "Maryport"
This region may no longer exist, but please doube check your
spelling and coordinates to make sure there aren't any errors and try
again.
If you problem persists, contact Second Life Support.
There is a square button: Hide message
When I paste the same SLURL into Firestorm, I teleport as expected.