I did manage to get around this, but when I initially installed the wpmu dashboard, I couldn’t get the link to sign into my own account to work on the initial “get api” page. The page was frozen on the “create a username and password” view.
Finally, I clicked the support link in the left nav and fortunately that put me onto a login page which allowed me to log in with my existing credentials, thereby accessing my api key – but still.
You should look into it.
I took a screenshot, but this support dialog in the dashboard doesn’t have an attach image feature that I see, so let me know via email if you need the screen cap.