I'm going crazy with this mu issue.
I have 4 main domains using soem subhosts as blogs.
I always need to login 6-10 times so that I can edit posts.
it seems that wordpress accepts the login, but nothign changes - I still get the login box.
when I enter a wronguser/password..I get an error message.
I have this issue from other computers to, even on other webhosts.