Seriously, take a look at some the threads in the MultiBit SubForum:
https://bitcointalksearch.org/topic/multibit-hd-051-the-correct-password-did-not-unlock-the-wallet-restore-fail-1866008
https://bitcointalksearch.org/topic/please-help-2btc-locked-because-the-password-did-not-unlock-the-wallet-1733063
https://bitcointalksearch.org/topic/cant-log-in-to-multibit-1979893
https://bitcointalksearch.org/topic/multibit-hd-on-mac-incorrect-password-error-lost-wallet-words-reward-1963950
https://bitcointalksearch.org/topic/multibit-hd-the-password-did-not-unlocked-the-wallet-1951723
https://bitcointalksearch.org/topic/locked-out-of-my-account-1901987
https://bitcointalksearch.org/topic/multibit-can-not-get-into-wallet-password-correct-1944436
The most damning part is the fact that the biggest issue (Password did not unlock the wallet) was reported to Devs back in April... and still no sign of a patch/fix: https://github.com/keepkey/multibit-hd/issues/982
TLDR; Stay away from MultiBit HD
It looks like Multibit is going downhill, huh? It was such a great project!
I guess I have a lot of catching up to do!