Pic-signature problem

Im in front of a strange problem.From today morning i cant see the pictures that some of us has instead of a signature.In the place which suppose to be the picture there is only a box in the size of the picture with an ''x'' up left.To be more precise i notice this problem to RadarMan's and mypilot's signatures.

Any suggestions?

Thanks in advance

originalgruge has that in his avatar also.

My aircraft is hosted on http://img4.imageshack.us/ and the site has been down for two days.

I see.OK.

Thanks a lot.

I'm officially disgusted with imageshack, I just switched my signature to http://photobucket.com/register.php .
I had an account there also.

I think mypilot has to switch too.