i saw now, after updating from one of the last knews versions 1.?.? to knews 1.2.8 that there on the "...page=knews_stats"-page the files=chart1.png, chart2.png and chart5.png aren't generated anymore.
but in the previous version (?) and in another nearly fresh installed knews 1.2.8 on another wp-site this is working best.
should i have to reinstall knews 1.2.8?
but how to save first the allready finished one newsletter, it's possible?