It seems as though the white stuff is a liquid because it seeps out.. however it is dry by the time it hits the air and when i wipe away, i almost need to scratch it off if that makes sense. I don't hear any difference in noises when i tap the frame. Like I mentioned, I have ridden since first noticing the crack and have really tried to 'bag' my bike by staying seated longer and really hammering on the pedals trying to induce flex with no new increases in size. However with that said, the second picture with the weeping white stuff was not there when I first noticed the other crack, so I am assuming that one is new.
I have a thompson 410mm seatpost, it is well into the frame and was purchased when I got the frame and still looks new. I don't think it is stress from the post.
Not trying to scare anyone from the frame. It has been good to me and still seems to be holding up fine. Just thought others should know and perhaps look in the same area to see if their frames perhaps have the same thing. It wasn't until I was on a giant anthem frame forum until I seen a thread on cracked frames and sure enough when I looked mine was cracked.