Problem with Thumbnails#2

[Optiplan]

Image files shows wrong thumbnail if i use Thumbnails#2. Files are missing in the directory listing.
Names appear in the right order, but Thumbnails are in wrong order.
If i click on the image, it open the image corresponding to the name.
Some thumbnails are scrambled.
The problem does not append with Thumbnails#1 and Thumbnails#3

[admin]

Probably your thumbs cache is not okay. Simply refresh it: View | Caches | Refresh Thumbnails