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Various people have reported PuTTY crashing when connecting to recent FreeBSD OpenSSH servers. Most commonly after upgrading to FreeBSD 4.6-STABLE (server version "OpenSSH_3.4p1 FreeBSD-20020702"), although there are minor variations. Use of keyboard-interactive authentication (e.g., PAM, OPIE) with SSH-2 appears to be a common factor.
A workaround is to disable use of keyboard-interactive auth (either in PuTTY, or on the server with "ChallengeResponseAuthentication no").
Update: we believe that this is fixed as of the 2002-08-04 snapshot (and we've had confirmation from one of the original reporters).
Audit trail for this bug.