Hi Kevin,
I'm just trying to back track the steps that you took.
Did you click Customize > Display, change the logo and click on "Regenerate Pages"?
or
Did you click Customize > Display, change the logo and click on "Save Settings"?
If you click on "Regenerate Pages", it will take approx. 15 minutes to regenerate all the pages on the server. During this time, you won't be able to log back into Method.