Images in Posts Won’t Display

I installed WordPress last summer for a family blog and haven’t been updating it very frequently.

When I initially installed it, I could write posts and insert images through the built-in WP image feature.

Now, however, the images won’t display in the posts. They display in the admin side when I am writing the posts, but not on the public side when it is viewed.

Is this a permission error? I had to go back and change permissions on several folders that had been reset from the last time that I used it.