Zimpo Crystal

viewer stops responding while "loading world" or if shape or skin is changed. if log in succeed - instead of my avatar i can see only smoke. ...and that is going on for days and weeks - and i dont thnk just clearing cache solves the problem cause same thing happens again and again on almost every log in try. viewer works fine with another avatar and there is no any of those problems with another one. what should i do to fix this problem - i mean, how do I keep the problem fixed (cause i dont think cache must be cleared before each log in try and even if cache is cleared there is a 50% chance my av would be just a smoke)? Zim