Problem installing F19 under Hercules 3.09

[Ian Shorter]

I'm trying to install F19 s390x under Hercules 3.09 running on an F19 x86_64 machine, but without success. When I had Hercules defined with NUMCPU 1, I usually ended up with the install in a 6-instruction loop. Having read elsewhere that single cpu's might be a problem, Hercules is now defined with NUMCPU 2, which produces different results.

I always get to the "Please ssh install at blah.blah.blah (192.168.236.200) to begin the install" message. I ssh and start the vncveiwer. The vncveiwer window in blank (black), although sometimes a grey rectangle appears, until it is closed. The ssh messages for the last three attempts were:-

Attempt one.

Please manually connect your vnc client to blah.blah.blah:1 (192.168.236.200) to begin the install.
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
python: xcb_io.c:179: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed.

Attempts two and three

Please manually connect your vnc client to blah.blah.blah:1 (192.168.236.200) to begin the install.

(anaconda:824): Gdk-WARNING **: anaconda: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.

My generic.prm contains:-
ro ramdisk_size=40000 cio_ignore=all,!0.0.0009 rd.dasd=0.0.0120 ip=192.168.236.200:192.168.236.100:192.168.236.100:24:blah.blah.blah:ctc0:none rd.znet=ctc,0.0.0600,0.0.0601,protocol=0 root=live:http://dl.fedoraproject.org/pub/fedora-secondary/releases/19/Fedora/s390x/os/images/install.img nameserver=192.168.3.206 vnc

I assume the problem is a timing issue, but I don't know where to start looking. What info, if any, can I provide? Any suggestions gratefully received.

Regards, Ian