trustdb transaction too large

[Claus Assmann]

When I tried to import a new key (0xFAEBD5FC from Philip R. Zimmermann),
I got the following error message:

$ gpg --import pz.key
gpg (GnuPG) 0.9.7; Copyright (C) 1999 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.

gpg: key FAEBD5FC: public key imported
gpg: sig FAEBD5FC.792/C0B8/0A56F93F: public key not anymore available
gpg: trustdb transaction too large
gpg: trustdb transaction too large
gpg: trust record 1728, type 11: write failed: resource limit
gpg: The trustdb is corrupted; please run "gpgm --fix-trustdb".


Is this a known problem? (I haven't found it in recent mails).
The key is pretty large and has nearly 500 signatures...
Or is it "just" an incompatibility with PGP?