0.4.5RC2 still heavily leaking kernel memory

ros 0.4.5-RC2

VBox 4.3.40 + guest additions installed
I just have taskmgr opened and let the system idle on desktop with that window open.
"Available physical memory" is constantly decreasing at a rate of around 25MB/hour.
Means you can see the counter decreasing maybe every 5to10seconds with your eye.

The user mode processes page looks rather stable, so I guess it must be in kernel or drivers area.

At this exhaustian rate I expect the BSOD on my 1000MB RAM VM to appear within 2days after system bootup. see attached slideshow:
045RC2_00hours.png
045RC2_02hours_50MB.png
045RC2_10hours_250MB.png
045RC2_20hours_555MB.png
045RC2_33hours_AlreadyBrokeIntoDebuggerBSOD0x1a_LastPicOfDesktop.png
045RC2_33hours_BSOD0x1a.png
045RC2-l2l.log