Passwords not recognised after install

Hi,
I've just upgraded my MBP to Mountain Lion and the two user accounts installed will now not login at the opening screen. Nothing has changed other than the install.
I've tried a Command R and password reset via terminal but still nothing.
Help? I'd read the horror reviews of ML but chose to show faith with Apple, now I can't use my laptop!
Thanks

I had to hack it via terminal and create a new admin account in the end:
create a new admin account:
1. Reboot
2. Hold apple key + s key down after you hear the chime.
(command + s keys on newer Macs)
3. When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):
mount -uw /
rm /var/db/.AppleSetupDone
shutdown -h now
Not happy.

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