Media button not working

I have a website which has many pages on which I regularly add new images. There is one specific page which all of a sudden the image button Will not work so I cannot add an image. I have also noticed that the revision at the bottom of the page does not work either. This is only on one page all the other pages are fine. I have tried different browsers and have cleared cachets on all browsers and it has not made any difference. I would be most grateful for some advice. Would it be an idea to design a completely new page and start again?