Same happens here. The obvious answer is to ask Dano21 to remove his sig or upload the image here. It's against forum rules to link images to other sites. I would have thought a forum regular like Dano would know that.
Important : Do not link to these images from other sites. Members found doing this may be banned & images deleted.
It's not a big problem. You can view the thread if you click Cancel. I imagine it's the same for your Inbox if he sent you a PM.