Viewing a file with totem plugin makes X crash

Binary package hint: xorg

When I go to http://www.radiofrance.fr/chaines/france-culture2/sommaire/ and click on "Ecouter le direct", and wait for about 20 seconds, X crashes. Removing "totem-mozilla" solves the issue (Epiphany uses another player).

I'm on Feisty, with an ATI Rage Mobility P/M AGP 2x, X.org 1:7.2-0ubuntu11.

Here is the X log:

[...] ProcXCloseDevice to close or not ?

Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x81) [0x80c5d91]
1: [0xffffe420]
2: /usr/lib/xorg/modules/drivers//atimisc_drv.so(ATIDivide+0x29) [0xb7bd0da9]
3: /usr/lib/xorg/modules/drivers//atimisc_drv.so [0xb7bc46fe]
4: /usr/lib/xorg/modules/drivers//atimisc_drv.so [0xb7bc47be]
5: /usr/lib/xorg/modules/drivers//atimisc_drv.so [0xb7bc5678]
6: /usr/X11R6/bin/X [0x80d9b96]
7: /usr/lib/xorg/modules/extensions//libextmod.so(XvdiPutImage+0x174) [0xb7c803d
4]
8: /usr/lib/xorg/modules/extensions//libextmod.so [0xb7c83398]
9: /usr/X11R6/bin/X [0x81424ce]
10: /usr/X11R6/bin/X(Dispatch+0x19f) [0x808c61f]
11: /usr/X11R6/bin/X(main+0x495) [0x8074785]
12: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0xb7db6ebc]
13: /usr/X11R6/bin/X(FontFileCompleteXLFD+0x1e1) [0x8073ab1]

Fatal server error:
Caught signal 8. Server aborting

Please feel free to ask more infos, I don't really know where I can find more for now...