When browsing with MicroB, cookies aren't working properly.

For example:
When trying to access Facebook, I'll enter the correct login info and it'll take me to a page telling me to enable cookies. I can log in if I press the back button and go to the login page again and login, but I can never get it first go.

Also, when trying to log into my school's site, it won't let me log in, as it says "You must enable cookies", yet in my settings it is set to always allow cookies.

I've rebooted and tried many times but it's always the same.

What can I do?