Ditto that problem, Chrome is saving the form information (save password selected at first login) but the checkbox remains unticked and I must click to login.
But, y'know, I'll live. And I can get onto this bit now as well (ta Giles) so overall my situation has improved.
I'm no phpbb expert either, but I see this problem in a board I administer as well. One possible workaround is to up the session expiration time in ACP -> Load Settings - > Session Length ?
Edit: it maybe related to the cookie's domain. I'm accessing this forum through the name "minotaurproject.co.uk", but it looks like it obviously predates the Minotaur Project...