[vtkusers] X crashes on exit when using Mesa

[Tarjei Knapstad]

I'm developing on a linux machine with an NVidia GF2 graphics card and
NVidias linux drivers, and all my Vtk stuff works just fine and dandy
here.

Just recently though, I tried running my application on an older laptop
which only has Mesa GL libraries. The application ran just fine up until
the pointed when I tried to exit it. X bombed out with an error log that
just stated "Fatal server error".

I tried debugging the app on the laptop, and the crash occurs somewhere
in exit() when cleaning up static objects etc.

Is there some important cleanup that I may have forgot? Has anyone elese
ever stumbled across this? The Mesa version I'm using is 3.4.2, but
upgrading to 4.0.5 didn't help. XFree is version 4.1.

Regards,
Tarjei