I have had nothing but problems with the TMO site the last few weeks in general. It never wants to load phone page for me, and their online account management never works right. Will show its loading but then nothing ever shows up :-/
The only problem I have with the T-mobile site using Firefox is when I installed Adobe flash player 10. I had to download and reinstall flash 9 now everything works great.
I have a different question. Is T-Mo data down? My prepaid SideKick has been searching for a signal for the past half hour. My BlackBerry email address is slow to get email. I sent a test email a minute ago to it and it hasn't come yet.