Oh dear. Sorry that that happened. If you don't want to start over and hope for a better password, you can circumvent the input issue by temporary changing your keyboard layout to have no so-called "dead keys". For instance, if your keyboard layout is "US International", change it to "US" (and later change it back, assuming that is the desired behaviour). I'm also uploading a new build right now that will prevent certain characters from being used in a password (and will fix such passwords if they happen to be loaded from a savegame).