Trouble with the next navigation in my gallery

Hallo,

I installed the newest version of the gallery and I'm really satisfied with the solutuin. But I got some problem with the navigation. When I reach the 6th image than I can't continue with the next picture. I just get ever the 6th one. When I go to the last picture, than I press PREVIOUS than I get the 7th, than the 6th and than I hung. I have no idea how I can solve this problem. I imported the picture per ftp-upload in a temp. directory and add to the album via the local server directory.

May someone can help me!

Regards
Joern

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Gallery URL (optional): www.steltner.com/gallery
Gallery version:
Webserver (with version): 1.3.26
Datatabase (with version): 4.0.22
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Graphics Toolkit(s): ImageMagick
Operating system: Linux
Web browser/version: IE