photo gallery problems

Dear wordpress staff,

I have the following problem and couldn’t find a sollution yet or some other simmilar posts.

I use the <add an image> button at a new post, then upload a couple of images (6 for example). I save changes and then I click as usual on the <gallery> tab. (It shows the number of photos in brackets). But when the gallery tab loads, there is nothing there. It seems like it never completely loads. I only see the table head (Media/Order) but no contents. I cannot insert a gallery so… All images are sucessfuly loaded in the library.

Kind regards,

George