I know that this is an old thread, but I think it's the best place...
I've just been caught out by this - luckily nothing major, but still a production server issue.
I had my QA server set to blue and production set to red in my Registered Servers list, but, for this little-used server, I had got a different setting under File/Connect Object Explorer/Options and this is the colour that seems to take priority when using the 'Connect' button in Object Explorer.
I then managed to execute some QA code on production and stuff up an important SQL Agent job, which we rapidly unstuffed:-)
Does anyone know where these settings are held? I'd like to remove anything that might override what I have set up under Registered Servers.
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.