If you click on an image on a post on the main page, it redirects to the main page instead of going to the post. I assume you want it to link to the actual post.
Yeah, that's an issue I'm working out. When inserting an image WordPress inserts the URL for the image attachment page so with some help I have a function that checks for the permalink and puts that in the link box by default. If the post is a draft it doesn't have a permalink so it just puts the domain in.