BM 3.7sp2, NW 6.0sp5, edir

I went in to filtcfg this morning and defined a filter exception to allow
IMAP. When I saved the filter the server dropped immediately into the

Now when I reboot it goes to debug every time, problem caused by filtsrv.nlm.

I deleted the filters from DS and the filtcfg file, ran dsrepairs, disabled
filter support for ip and ipx. Same thing every time. I can boot -na -ndb
and then reinitialize the server, filtsrv loads and packets are routed ok.
But if I just try to boot it up I get the debugger. Any ideas, help or
suggestions more than welcome!