I don't see any other posts about this so it makes me think the trouble is on my end, but I can't figure it out. I get no sound on the Jan challenge video 4---all others work fine-----cannot get audio on vid 4---anybody else????-----------PS---also had this problem on vid 3 for 1 day, the next day it was fine--I just figured it was a problem on Griff's end--he seen it--fixed it---no problem---right? Waited a couple of days on vid 4 thinking the same thing happened on Griffs end and he would soon fix it-----no such luck this time---anybody????