Trouble exporting to png

[François Désarménien <francois fdesar net>]

Hello, dia-list !

I have a diagram, created with version 0.86 which I need to export to png.

With dia-0.86, it worked but some parts of the diagram were missing.
Exporting to .eps had no problem.

So I upgraded to 0.88.1. I still can export to .eps but when I try to
export to .png, I have the following error message :

libpng error: No IDATs written into file

Any clues of what could I do ?

It is quite a complex diagram I don't want to waste time to redraw :-(

Thank you for your time,

François