Extend/Debug Slideshow-Gallery Wordpress - repost

Hi, looking for somebody who can fix an issue regarding the gallery on my wordpress site. I got a gallerie plugin (Slideshow-Gallery) there which works fine in general When clicking an image for a larger view it opens in a lightbox. Unfortunately there are no previous/next buttons there to get to the next image of the same post. Im not sure if this gallery should have the option for prev/next and if it just doesn't work, or if there is some bug. Added 2 screenshots for you to see what I mean. Picture 1 : gallery overview: there are prev/next buttons Picture 2: detail, lightbox view; prev/next is missing I hope I could bring my point accross and there is a quick solution. thanks and regards martin