OK, that occasionally happens, and it's invariably on the user's end, not on the server end.
Do two things...
Delete your browser history, and delete your TFL cookies.
Invariably the problem is linked to one of those.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.