here is my story:
Yesterday i had suddenly problems to open my MultiBit HD 0.4.1 wallet ====> password wrong!
https://bitcointalksearch.org/topic/please-help-2btc-locked-because-the-password-did-not-unlock-the-wallet-1733063
https://bitcointalksearch.org/topic/is-there-a-bug-in-multibit-that-makes-the-correct-passphrase-not-work-1657723
https://bitcointalksearch.org/topic/help-updating-from-multibit-classic-to-multibit-hd-too-scared-1733636
By the way: it was not possible to restore my wallet (from the paper words) on 4 different PC's using multibit 0.4.1.
Symptoms: the first time i can open the wallet (it does not matter which password i used at the restore) but after a full sync i can not open the wallet again (---> password wrong)
recovering the password did not help (it just told me the password i'am used)
After spending 4 hours on different PC's i gave it up and deinstalled the software and try on my home PC to use different version of MultiBit HD (with the paper restore).
i tested :
0.2.0
0.1.4
0.1.2
0.1.0
The same as all the other tries before ...... but 8 hours later, late after midnight,
in 0.1.0 i get all my transaction confirmed but try to send them brings the aes-error.
Closing the program and restarting it brings the passwort wrong !
Because on these 4 PC's there are no backup wallets to restore, there is no way to get access to my funds!
Today in the morning i used my main PC (where i used MultiBit since 2015)
i could unlock my wallet (with a backup wallet from january 27)
all 'younger wallet backups' could not be restored (ended with error)
i transfer 1 btc to a different wallet (but only one transaction is possible)
The next transfer has an aes-error (so i had to restore the wallet again to january 27 wallet for every transaction).
Sure not to close the wallet (otherwise password wrong)
Now i managed it to convert all of my funds to a different wallet (not multibit)
Maybee that helps people having the same problem to migrate their funds or massive problems with unconfirmed transactions!
I think everyone could get the error (that should be an program-error since version 0.1.0)
..... but for me it is sure: multibit never again!