rasheed

Did you try running multiple instances of ImgBurn?

Thank you for reacting so quickly. I have just checked out things myself again. After fully uninstalling previous version, and then installing new version, everything works fine. I really double checked everything before posting here. I have no idea what was causing it, but it was there. It seems as if settings from the previous version were the cause of the bug. Thanks again, and thank you for such a great program. Sorry for the trouble.

Well, just as topic title says, the "Optimise Duplicate Files" option got broken somewhere between version 2.3.0.0 and 2.3.2.0 (I do not have version 2.3.1.0, so I can not say exactly when it got broken). The bug itself manifests the following way: When the optimise duplicate files option is on, the contents of duplicate files are replaced with the contents of the ISO file being created. File sizes are not changed at all, just their content. for example, create two folders, lets say 01 and 02, with identical files in those folders (I have used files which vary in size form ~ 18 K to approx. 1.8 MB) Files which reside in folder 01 will be allocated normally, and their content will be exactly as it is on the hard drive. Content of the files which reside in folder 02 will be replaced by content of the ISO file that is being created, as if the ISO file is being created first, and then duplicate files get overwritten by copying content from the iso file up to duplicate file's size. I must note that images created by the two different versions of the program differ in size. I hope that this bug report was helpful.