Gallery admin pages not working

The Gallery admin pages are not working.
1. Galleries display first admin page ok with correct number of images noted. When I click to look at the next admin page of the gallery no images are visible and the numerical value for images is shown as 14. When I click back from there. I see no images for the gallery any more, it takes me to a subset of 14 images from other galleries instead. And then the same scrolling forwards – 14 images of another gallery.
2. I can not delete images from the gallery – it looks like they are deleted – though the screen it goes to looks odd after deleting (like above.. no images visible with number 14 shown.
3. The small window which holds the drop down options – delete / publish / unpublish etc (used to to apply to all or some of the gallery images)looks odd – full of small triangles. Maybe that is as its meant to be now as the drop down itself appears ok if selected, but does not seem to work as above.
4. Despite the above the actual web page gallery looks ok even displaying an image I added.