Image problems

Hi

I’ve been adding posts and inserting images from computer with no problems. But now it won’t display the image on the front end. I can insert an image into the draft, but all I see is a white box where the image should be. Previously – I could see the actual image in the draft. And no image displays on the front end. Also, if I link to an image, it will only display on the front end Large, even when I try to reduce the size in edit. Using jpeg image.

Forgot to say, I added a plugin today for adsense – but I couldn’t get it to work so de-installed it and deleted it, thinking this may have caused the problem.

Any ideas please?