well firstly check remembering password etc, enable this page's cookies. ehm, try not closing the browser after you login, it should just return to that one.
try those sort of things
furthermore, the server change might or might not be effecting it, i cant say anything on this
try to refresh the page by pressing the right mouse button and select the mentioned option.
Had the same problem. Redownload the home base kml file, delete the old one, and try and set your homebase again.
Just worked for me anyway.