Twelve frozen MUTTs in one GNU Screen session

[Ethan Mallove <ethan.mallove@xxxxxxx>]

I have about 12 instances of MUTT (each with a different
IMAP folder open) running in a GNU Screen session. They all
got stuck suddenly, and I can't figure out why. The "pstack"
traces all look similar for each stuck instance of MUTT (see
below). 

  $ pstack 31477
  31477:  mutt -y -e push "<change-dir><kill-line>=Inbox<ente
   fefc5900 read     (4, 1a0c88, 5)
   ff1b5f6c sock_read (283380, 1a0c88, 5, 0, 5, 0) + 2c
   ff1b2f6c BIO_read (283380, 1a0c88, 5, 1a0c88, ff24c684, 1) + 10c
   ff2f7260 ssl3_read_n (664788, 0, 5, 0, 5, 3) + 160
   ff2f73a4 ssl3_get_record (664788, 664788, 4400, 4000, 4400, 4000) + a4
   ff2f829c ssl3_read_bytes (664788, 17, 17dfac, 400, 0, 0) + 1dc
   ff2f58e8 ssl3_read (0, 17dfac, 400, 1b1178, 220cc, 664788) + a8
   001059cc ssl_socket_read (17de60, 17dfac, 400, 2, ffff0000, e) + 34
   00103df8 mutt_socket_readchar (17de60, ffbfc383, ffffffff, 2, 0, 80808080) + 
50
   00103f28 mutt_socket_readln_d (17e3e0, 200, 17de60, 2, ffff0000, e) + 38
   0010d950 imap_cmd_step (180a50, 1ab888, ffffffff, 2, 0, 80808080) + c8
   0010ddb8 imap_exec (180a50, 137048, 0, e, ffff0000, e) + 130
   00113ce0 imap_check_mailbox (17d7c0, ffbfc6d0, 0, 0, 0, 80808080) + 218
   0009f358 mx_check_mailbox (17d7c0, ffbfc6d0, 0, e, ffff0000, e) + 120
   0005df78 mutt_index_menu (17d7c0, 0, 0, 0, 0, 80808080) + 310
   0008d2d0 main     (4, ffbfd61c, ffbfd630, 148400, ff0c0100, ff0c0140) + 1638
   0003a810 _start   (0, 0, 0, 0, 0, 0) + 108

  $ mutt -v
  Mutt 1.5.17 (2007-11-01)

  $ uname -a
  SunOS ... 5.10 Generic_127111-07 sun4v sparc SUNW,Sun-Fire-T200

Note, I was able to successfully start up another MUTT in
the same Screen session.
  
Any ideas on what has happened? Is there a way to revive them?

Thanks,
Ethan