Quote from ydfah:
Go to page 28 of this thread and read my post, (the third one down.) Apply the patch and see if it straightens things out for you.
Quote from j_medved:
No. Login works regardless. Try going to this URL using IE browser (specifically IE, NOT firefox, chrome, etc)
https://apis.tdameritrade.com/
You should get a page about the document you requested not being available (that is not a problem). The thing to check is if you are getting any security certificate error/warning when you try to go to that page. If so, that would be the cause of the login problem
Quote from j_medved:
Can you do Windows Update to get latest updates for IE? Or update to IE 8 or 9? that will most likely fix the issue