Too many dynamic rules

Hello,

Today I booted r242670 from the console and noticed an error.  This
is one line from the end of dmesg:

ipfw: ipfw_install_state: Too many dynamic rules

The ruleset has always been dynamic and has no additional rules.
Search engines produced similar error messages, but no information
that seems to be the correct solution.

I have a basically identical ruleset on fbsd91 and no error message.

Any ideas?

Darrel