I'm running 23.3.1 with gnus just fine, but 24 hangs retrieving imap from
gmail.

OS: Windows Vista
version: "GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of 2011-03-14 on 3249CTO"

*Messages*
Opening nnfolder server on archive...done
Opening nnimap server on gmail...
Opening connection to imap.gmail.com via tls...
Opening TLS connection to `imap.gmail.com'...
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.gmail.com'...failed
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.gmail.com --protocols ssl3'...failed
Opening TLS connection with `openssl s_client -connect imap.gmail.com:993 -no_ssl2 -ign_eof'...done
Opening TLS connection to `imap.gmail.com'...done
Quit trying to open server nnimap+gmail
Opening nnimap server on gmail...failed: 
Opening nntp server on Gmane...done
8 new newsgroups have arrived
Checking new news...
Reading active file from archive via nnfolder...done
Reading active file via nndraft...done
Checking new news...done
Warning: Opening nnimap server on gmail...failed: ; Quit trying to open
server nnimap+gmail

Note: gnutls-cli fails here as I renamed it, gnus was ignoring this
option I've set in .gnus

(setq imap-ssl-program "c:/cygwin/bin/openssl.exe s_client -ssl3 -quiet
-connect %s:%p")