I keep getting this error message when i try to unlaod FILTSRV.NLM.

Free detected corrupt preceding redzone for node 0x800B9520

I beleive this is causing some trouble with my filters. I looked thru the
KB and came up empty. This is on my BM3.7sp2a server running NW6. If
anyone can shed a littl light on this I would appreciate it very much.