[PyMOL] cannot save .png files

[kostas <ko...@nm...>]

Hallo I've just installed macpymol using the disk image and playing 
around to get familiar with the program I found that cannot save 
images. The error that I get is:
  ScenePNG-Error: error writing "/NEB/pymol.png"! Please check 
directory...

I will appreciate any help