Did you restart pcmcia when you deleted bm3.conf? If not, try that.
Otherwise, can you turn on syslogging? I don't know how it is setup on the 6000, but on earlier models, you had to uncomment the line in /etc/syslog.conf that contains "/var/log/messages" at the end and then start syslog using
/etc/rc.d/init.d/syslog start
Then you can look at the system messages in /var/log/messages when you insert the card. This should tell you what the PCMCIA subsystem is doing with it.
Once you are done, remember to comment that line out again and stop syslog as the log file can get rather big.