Hi, hope this might help some.
My wallet was working perfectly fine until yesterday, i couldn't get it even when using the right password.
It gave the legendary error of can't open wallet using this password. I had enough coins there that i could've died of heart attack in a week.
My stupidity, I secured my MultibitHD wallet too hard that i forgot the RAR file password which had the 12 Words of my wallet.
I had corrupt mbhd.wallet.aes and good zip.aes backup....useless backup.
Solution is simple though:
Recover your 12 words using this tool if you have wallet password: (Thanks to internet)
https://github.com/gurnec/decrypt_bitcoinj_seed
Recover private keys using this page: (Thanks to Hi-Tec99)
https://iancoleman.github.io/bip39/
Check balance in the shown address here so you know which keys to keep:
http://www.homebitcoin.com/easybalance/easybalance.html
Lesson:
Never use Multibit-HD