Thanks for yours help! But install new version 1.5.0.8 doesn't solve the problem. I've tried uninstall and the re-install in another local disk (E:/ disk) and many another methods but all have the same result. May be it's have some old-setting-files in Affinity still stuck on my computer make this: I've take my mind on the "Export-PDF-Window" and I see the words: "Estimated File Size: Calculating....". Affinity can't calculate the final PDF-exporting-file-size in very long time (may be forever, I've wait for it). But itsn't happen in other format. You can see in these screenshots: http://www.mediafire.com/download/jaih2a672cuj2lf/Inf+pdf+err.rar p/s: I already have my expected pdf files by use a program convert EPS to PDF one more time, thanks yoụ!