[Dovecot] errors in logfile

I just upgraded to -test47 from 0.99.11-test4, and am getting a bunch of these messages in the logfile:

dovecot: Oct 14 07:30:21 Info: imap-login: Login: andrew [64.36.1.74] dovecot: Oct 14 07:30:22 Error: IMAP(andrew): sigaction(SIGRTMIN) failed: Invalid argument dovecot: Oct 14 07:30:22 Error: IMAP(andrew): fcntl(F_SETSIG) failed: Invalid argument dovecot: Oct 14 07:30:22 Error: IMAP(andrew): read(event_pipe) failed: Is a directory dovecot: Oct 14 07:30:22 Error: child 7047 (imap) returned error 89 dovecot: Oct 14 07:30:22 Error: child 6631 (auth) killed with signal 11

Any ideas? How can I get more information about what's happening there?

Thanks.

-D

<Nigel> Please refrain from fearing the reaper.