I've noticed that after setting "Ignore local traffic within the LAN" option nonpaged kernel memory easily reached gigabytes within a day or two. Or rather I noticed that memory is just disappearing and then traced it to networx and this particular option.
Windows 7 x64, 8GB RAM, NetWorx 5.2.9 64-bit. Network adapter is integrated Qualcomm Atheros AR8151 PCI-E Gigabit Ethernet Controller with driver version 2.0.?.? and latest 2.1.0.21 (upgrading made no difference)
Leaking memory pool tag is NDnd.