tried searching for this particular issue, but came up with nothing. all apologies in advance if i missed something.
when manually upgrading from 2.3.3 to 2.5 i get the database needs upgrading which then after hitting the upgrade button it takes me directly back to the initial page of the database needs upgrading. so, its just an infinite loop. i disabled all plugins before attempting to upgrade. thoughts/advice would be greatly appreciated. dont know if you need the site but its captainsdead.com.
i had this issue six months ago, and for the life of me cant remember how i fixed it.