Also, as a quick workaround, you can take a GE snapshot (you can toggle it off any time) and that will set your location in SU. Even "more also", Jim has created a plugin that will allow you to set the location on the free version of SU. Also he has a Sun tool and a Map Sun plugin for shadow studies.
Finally, have you tried the new version of GE for shadow studies? Have a look at this thread (and the link in the first post). It seems to be really cool!
And well, as it turned out that it's not a "bug", I'm moving the topic to the main forum now if you don't mind.