Hi Monika,
The systems I checked are OSX 10.9 and 10.8.
The font is "The Sans". FEX Pro is used as fm. No special characters used. Did not try to use another font as the charts open only in corrupt form.
The files have been saved on an afp mounted server environment with extreme z ip running for osx compatibility.
I only have pie charts created with the chart module. All other charts are hand drawn. Only the pie charts (data for chart creation retained) are concerned.
As last modification, I've added a stroke to the charts. Since then, they don't open anymore.
Here are some test files before and after the modification: https://dl.dropboxusercontent.com/u/9429870/CORRUPT_CHARTS.zip
Could you tell me what the above answer will exactly tell, since you are expecting a font problem?
Correction to the above post: The files open with CS6 down to CS5.5 only. But the chart data are going to be lost.
Thanks,
Yves