Hello and thanks for your purchase and support!
First of all, make sure the attached folder has a corresponding .info file (icon). If not, click the folder one (mark it) and then select the small down-arrow located in upper right corner of your window (DOpus Lister) and select Add Icons.
The .info file will be created where all the folder information is stored, like it's position, default view, etc.
Now doubleclick the folder, click the second toolbar icon to show the icons instead of a list. Now right-click the upper window bar and select Snapshot Lister. It saves its position and default view. If you select Snapshot Icons, the folder content positions will be saved.
Hope it makes sense