I have found a temporary solution to the problem, until it will be fixed you can use URL’s shortener to media services. You go for example to http://goo.gl/ and paste YouTube (or any other media service) URL you want to point to, shortener generates you a short URL you can use on a site instead a YouTube (or any other media service) URL. Received in that way short URL returns 301 status, that way pointed site gets all SEO related stuff intact like it would be normal 200 status.
This solves problem only for links inside a post or a page. Links that i actually can edit by myself. The question is how I can deal with rel=”lightbox[auto_group]” problem when link is used for example in the menu of the site or any other item that is dynamically created by wordpress or theme functions. (for example: if i create custom link in wordpress menus I’m able to fill only “Link URL”, “Navigation Label”, “Title Attribute” so there is no option to set “rel” attribute, also creating rule that will add an “rel=”noLightbox”” to any link in menu is no an option).
This is not only image error. I have the same situation with any other link leading to any video service, no matter where on site link is put. Also if link is text or graphic this not matter link errors still occurs. From what I was able to observe, links to video services gets automatically rel=”lightbox[auto_group1]” attribute. That’s sucks big time. Hope someone will know how to solve this.