SirJahn - Try using Explorer's "InPrivate Browsing" mode and see if that'll let you log in from work. If not, could it maybe be a network issue? Since it's working for you from home, there's nothing I can do on the CIT side of things.
For anyone else with this problem: First thing to try is clearing your cookies and cache. However, it's sounding like some sort of setting or cookie is somehow lingering despite clearing cookies. I have no idea how. But please try one or more of the following if you are unable to log in after clearing your cookies:
1. If you have access to another computer, try logging in from it. (If it doesn't work, try clearing cookies/cache and try again.)
2. If you have other browsers on your computer, try logging in with each of them. (If it doesn't work, try clearing cookies/cache and try again.)
3. Try using your browser's private browsing mode: "InPrivate Browsing" for Explorer, "Private Browsing" for Firefox and Opera, or "Incognito" for Chrome.
If any of the above three items work for you, then that suggests that the problem is some sort of stuck cookie or setting in the browser that isn't working. The best advice I can offer is to try clearing all cookies, cache, etc. If that doesn't work, I'm honestly not sure what else can be done other than waiting and seeing if it eventually fixes itself. (If anyone else has any insights, please chime in!)