From: Axel Kohlmeyer (
Date: Sun Jan 22 2012 - 10:19:06 CST

On Sat, Jan 21, 2012 at 11:49 PM, Irene Newhouse <> wrote:
> I just, unfortunately, 'upgraded' my OS to Centos 6 from Centos
> 5.-something. I tried to render a VMD image using tachyon & got an error
> message indicating rendering was impossible because VMD did not have
> permission to write vmdscene.dat to the current directory. Has anyone
> encountered this already, and what did you do to fix it? This was not a
> problem with the previous version of Centos!

i cannot imagine that this has anything to do with your
software upgrade directly. it can be a side effect or
totally unrelated. possible reasons are the following:

- there is a hardware error on your hard drive carrying your
  home directory and it has been mounted read-only.

- your (numerical) userid is different and thus you don't
  really own your home directory and anything underneath
  it anymore

- you launched VMD in a way that '/' has become its
  current working directory, to which you have no write access.

can you generate other files? e.g. using "touch some_file.txt"

> Thanks!
> Irene Newhouse

Dr. Axel Kohlmeyer
College of Science and Technology
Temple University, Philadelphia PA, USA.