eBay does have a minimum size requirement for images, but it is not immediately clear what would cause such an issue with a relist. In order for us to take a look into it, we'd need to take a look at a few examples within your account. If you haven't already done so, please feel free to file a support case from under the Help tab of the site that includes a few item numbers or titles where this has occurred and we'll be happy to take a look into it.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .