Cant upload .gif to my site... Anyone?

Hello!

I tried for 2 hours, but I cant upload a gif to my site :disappointed:

It starts strange already when I upload the file,
it looks like this http://screencast.com/t/hJnXA5ja
(.gif file is uploaded and saved, but normally I see a little preview of the image on this site, not so with .gif's ...)

Also, in the gallery the -gif reults uploaded completely, but the preview image is missing: http://screencast.com/t/oBHKiBdb

When I upload to the site, the site I can see nothing (not even a static image of the .gif)

Anyone knows this issue and how to resolve?