Maybe it's because error appear:
-------------------------------------------------------------------
Error initializing quicktime
found bundled python: D:\Blender\25\2.56\python
-------------------------------------------------------------------

But even if the console does not disappear when an error, I do not want to see console when you start blender anyway.





Platform:
================================
Windows 7 Home Premium x64


Blender:
================================
BuildBot Version win32: 2.56 (sub 6)
Revision: 36105