OS: macOS 10.12.3 64bit
Sometime when I move my mouse over the photos thumbnails XnView drags nearest to cursor photo to point where I finish my cursor movement. So I need to resort pictures again. This happens in thumbnail view.
Effect: Photos resorted in wrong order.
To reproduce:
1. Open thumbnails view;
2. Just move cursor over the thumbnails;
3. You shouldn't press any mouse buttons;
4. At some time random photo under cursor drags to point where you finish your cursor move.
Actual behaviour (bug): Photo under cursor drags to some point

Expected behaviour: When you don't drag files they shouldn't move makes wrong sorting order.