Thanks guys for this thread which I found by coincidence while searching for the cause of a nasty memory leak in netio.sys. My system is a Windows Server 2008 R2 with IE9 and everything worked well until around October 2013. On patchday 15 updates had been installed and while looking for information about memory leaks in one of the updates this Thread popped up. Someone mentioned KB2888049 - unrelated to a fix to the problem, but just exact this update introduced the leak. I have deinstalled KB2888049 and now everything is fine again.
Hope that helps,
Klaus