Well, 360 Total Security is an advanced software that contains a SpeedUp tool for making your PC have a shorter Boot up time. That one probably decided to stop Miranda NG's auto-run in order to make PC start faster. Luckily I have option to exclude Miranda from that, but it would be better if 360 Total Security could do that by default.
Btw, there was no any big discussion. I just made a post on their Facebook page and they made some replies. I guess you can see it
HERE.