If you are also facing problems with the built-in lightbox, do some basic troubleshooting to attempt to resolve the issue. They reported that full size images are now being displayed in a normal browser window, with the browser back arrow required to return to the blog post, they can not use "X" button which closes the overlay. In this short tutorial I will tell you how to solve the Lightbox display problem in your blogger blog.
Update*: Now, the blogger lightbox issue finally fixed by blogger team and it is working fine now!!! So you may take down the lightbox code mentioned in this post.
3. After </body> Tag, Add The Following Code and Save Your Template