Radeon 9000 + Xinerama

X gurus,

Can anyone help with using the new Radeon9000 driver support with
Xinerama? The setup is as follows:

One AGP Nvidia 4400 (middle display)
Two PCI Radeon 9000s (left and right displays)
All displays at 1600x1200 (DVI)
Latest X from CVS
Binary drivers from Nvidia
Linux 2.4.19-16mdk

Here's the config:

   http://www.seanadams.com/x/XF86Config-4

If I try to start with all three displays enabled, X dumps core with a
bunch of warnings about unresolved symbols (I'm aware that these are not
necessarily a problem). Here's the log with all three displays enabled:

  http://www.seanadams.com/x/allthree.log

If I disable *either* of the ATI cards, everything works fine with just
two heads. Here's a log of that, with just middle and left screens
enabled:

  http://www.seanadams.com/x/justtwo.log

Disabling the Nvidia card doesn't make any difference. I also tried
putting one of the ATI cards in a different slot, and verifying that
they're not sharing an IRQ.

Now there's one other thing I should mention, but it's probably a red
herring: before upgrading to the current CVS source, I was using V4.2.0.
After upgrading, the new version was not able to find its libraries until
I exported LD_LIBRARY_PATH="/usr/X11R6/lib". The old version didn't need
this... how come? Did I miss a compile-time option? Is this related to the
unresolved symbol stuff above?

Any assistance would be greatly appreciated. Thanks,

Sean