when you say it only shows those three steps i'm assuming you mean it goes (for instance) left-right-left then totally stops? if it does, there've been a few people with playblast problems such as those and i don't believe any of them have yet to find the cause of the problem... BUT (just in case), if it doesn't just stop and instead goes left-right-left-left-right-left then everything's fine... cause most walk cycles consist of only two steps and loop after the last transition...