Twitter is crazy. Recently I tried to change my gmail account to a more secure encryted email on my Twitter account but they never let me confirm that email to my account. It always remained pending even though I clicked confirmation links several times. When I went ahead and reverted the email to original gmail account, everything was done seamlessly within seconds. I've had many similar problems with Twitter for years. The Spam Accounts, getting locked for apparently following 'too many' people in a short period of time, clicking confirmation links multiple times, etc and now this.