I didn't know there were log files or tools, should have checked. I will reproduce it when i'm finished editing a folder with the older version. The latest version was uninstalled after reinstalling with the same effect, So i'm pretty sure i can reproduce it and post log files. If it is such an unfamiliar error, logically it must be my computer which turned out to be totally virus or other malware free by the way. The .pdn file in question is 1000x1000 px, this file has only 5 layers which are mostly transparant. I'll post logs later.