Today when i started to post comments in some youtube videos, it asking for "sign in". I already sign in to that account, but it keep asking always when i try to post comment in any videos. I can easily post comment on any channel, no problem on that, i can send friend request also. And also i noticed that from last 3 to 4 days, youtube hangs my machines, some times it crashes also. Initially it asking for adobe flash player updates, i already update that, but still it slow down the machine huge and hangs after sending 20 to 30 friend request. Is any one know abt this? what happened?