Made sure secure transactions (anything requiring user credentials) are sent over SSL (https).
Thanks to Rick van der Zwet for pointing out the problem!
ANDREW SCOTT This is my favourite Twitter widget and I've tried quite a few. It's responsive and easy to use. My one complaint is that I can't resize the window to see a lot more tweets at once but apart from that it's pretty good. (Version 2.0.2)
DORKYPANTS When I click the Done button after typing in my Twitter username and password, nothing happens; i.e., the widget doesn't flip back to its front side. Not good. Reverting to 2.0.3 (Version 2.0.4)