Puzzling warning when changing a linear loop to a parfor loop. Need help.

I am trying to change a linear loop of image exporting to a parallel loop. In linear mode the export_fig (the function I am using, available here in the file exchange) works perfectly. In parallel mode, however, I am getting the following warning, and then the exported figure looks horrible:

Warning: MATLAB cannot use OpenGL for printing when started with the '-nodisplay' option.
> In graphics\private\inputcheck at 143
  In print at 156
  In print2array at 140
  In export_fig at 334
  In parallel_function>make_general_channel/channel_general at 914
  In remoteParallelFunction at 38

I should say, ofcourse, that the figures are loaded as invisible figures like this:

openfig(fig(i),'new','invisible');

could that be the problem or?

Thanks in advance

Jakob

[Jakob Sievers]

Ah, just stumbled across a comprehensive answer to this type of question: LINK

[Edric Ellis]

Which release of MATLAB are you using?