Dovecot - CMUSieve Errors

After upgrading our CentOS 5 box to the latest revisions this week (including Dovecot 1.1), we're seeing the following error message in the log files. Sieve was working fine with Dovecot 1.0.

# cat /var/vmail/dovecot-deliver.log

deliver(ruth@example.com): Jul 28 11:11:44 Error: dlopen(/usr/lib64/dovecot/lda/lib90_cmusieve_plugin.so) failed: /usr/lib64/dovecot/lda/lib90_cmusieve_plugin.so: undefined symbol: message_decoder_init
deliver(ruth@example.com): Jul 28 11:11:44 Fatal: Couldn't load required plugins

# ls -l /usr/libexec/dovecot/sievec
-rwxr-xr-x 1 root root 165152 Jun 11 03:21 /usr/libexec/dovecot/sievec

# yum list | grep "dovecot"
dovecot.x86_64 1:1.1.1-2_76.el5 installed
dovecot-sieve.x86_64 1.1.5-8.el5 installed
dovecot.x86_64 1:1.1.2-2_77.el5 atrpms
dovecot-devel.x86_64 1:1.1.2-2_77.el5 atrpms

Not sure yet what went wrong during the upgrade.

...

Update: The problem was that we had made a copy of Dovecot's "deliver" executable to make it setuid to work with virtual user local delivery. After the update, we forgot to update this copy of the exectuable.

Once we updated the setuid copy of "deliver", things worked fine.