I just updated to 2.3.3 and I'm still have the same cookie error problem. I've tried many things, but none of them have worked. Many suggestions involve deleting blank lines. I see a lot of blank lines in all my files. I'm sure I don't understand what is meant by a "blank line"
I've tried commenting out the three lines people suggest.
I've tried using Opera, a different computer, and so on.
In addition I have no problem logging in during the daytime, usually, but just no luck early morning or late night. The times seem rather standard (10AM to 10PM I can log in without the error), which makes me think it's related to something on my system, or related to my hosting service (fatcow).
What gives? I'm a bit at the end of my rope.
~alex