Sig 11 on switching from X to console

I have posted something almost identical to this in the nVidia forum - I
am sorry if that counts as a cross-posting here. Also, I do feel that I
need the nVidia binary driver - it would be nice if no-one responds just
to tell me not to use closed source (it is the only closed-source software
I have).

Ok here goes :

Can anyone help me to get a handle on this problem - it may turn out to be
distro-specific (Arch Linux), but at the moment the distro forum is not
producing any ideas.

I have a GeForce FX 5500. I have just updated to my distro's packages of
the 169.09 driver and utils running under kernel 2.6.24 and X.Org X Server
1.4.0.90. I boot into a console and start X with "startx". Everything runs
perfectly until I drop back into a console while X is running (ctrl-alt-
f1). Usually (not always), this crashes X on a Sig 11 :

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x7e) [0x80baf4e]
1: [0xb7fc1420]

Fatal server error:
Caught signal 11. Server aborting

I am not the only person to have this problem, but others don't see it at
all.

I upgraded the kernel at the same time as the nVidia stuff, so I have no
experience of the current driver under my previous kernel.

I don't know where to begin even in working out a test for how to isolate
or narrow down the problem.

Any ideas please?
.

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