memory usage increment problem in Beta2 SDK

I use IIS Smooth Streaming Format SDK 1.0 Beta2 version and now I'm testing long term live smooth streaming with IIS and smooth streaming player. Everything works fine except one thing that is memory increment. I think it's from the sdk internal program.

My OS is the Win2008 64bit.

I tested it like this : 

1. I remove all memory allocation and free function in my program.

2. All of encoding buffer is allocated at the program starting point.

Are there anyone who experience like me?