Problem uploading

Hi

Ever since I started setting up a D7 site, I have been having this problem, which has now however become a nuisance.

When uploading files, such as images, you have this blue rotating image, which I suppose is supposed to show an upload is in progress. The problem is it never stops to show the upload is complete & one just has to guess it is & click preview or save to move to the next step.

I have now been trying to upload audio files, which are larger, same problem.

What causes it & how could it be stopped?