Ill summarize for you. Simply my friend used for online payments for different sites he was using. Everything was working fine. A few more weeks later noticed a few problems wallet wouldn't load proper so he cleared everything out but backing up wallet and restoring. After updating his account balance across 3 of the addresses he had on it was cleaned out and he never withdrew the coins from wallet. When chain finished updating and doing what it needed to noticed a bunch of small transactions go out of his account somewhere totally random and lost his coins. it wasn't much luck but seems its iver to do with the sites he was using or multbit and I have heard other problems alike or not been able to use proper or some sort of issues along the way of using multi bit
Those are user faults, not MultiBit's faults. Your friend's PC got hacked, not MultiBit.