This happen to me yesterday for the first time with multibit hd, I thought they have some issues but today its still the same. When I try to open wallet, after I wrote password I got this:
The password did not unlock the wallet.
And I can`t restore password, I can`t do nothing, for the first time I was on their site and when I click on Contact Us, nothing is happening. This is very annoying situation, how to find and install 0.4.1 version? I will search for it also, and after I move my coins from there I will not use this wallet ever again.
Edit: Now I see other topics on this subject:
https://bitcointalksearch.org/topic/m.18139080 How to downgrade the wallet on 0.4.1 version, what a mess this is, I totally don`t like this kind of things.