Physically thin clients crashing when trying to boot

I upgraded our ltsp server to CentOS 6.4. I also upgraded the 
ltsp-server package. Did a ltsp-build-client, after checking the config 
files, removing the old /opt/ltsp/i386 directory, checking nfs, dhcp 
config, etc. A new virtual pxeclient is working, although X restarts the 
very first time you try and log in. The physical clients won't even boot 
properly. The error varies depending on the client.

dhcp is working. They can boot to the network using PXE and retrieve the 
img to boot linux.

The majority of clients crash after the "Booting Linux" message. A long 
list of messages; hex then a question mark then a message. Another 
machine that is different hardware, gives this message after "Booting Linux"

[drm] nouveau 0000:01:00.0 0x824C: Init table command not found: 0x06

I installed ltsp-server from the repo and I get these versions:

ltsp-release-5-9.el6.noarch
ltsp-server-5.4.5-22.el6.x86_64
ltspfs-1.1-7.el6.x86_64

Which is odd because according to the web page the stable build is 
5.4.5-20.el6 from the k12linux.repo (the s3amazon address I think).

Any ideas what is happening? Any help is much appreciated.

Thanks.

Gary.

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