Singlpic doesn't show picture for id>1000?

I had problem that in some cases display_type=’photocrati-nextgen_basic_singlepic’ didn”t show a picture, omly the alt-text linking to the origanal picture in other cases it works fine. Some trial and error suggest that images with and id>1000 are not presneted

http://wordpress.org/plugins/nextgen-gallery/