I don't know what happened with the software but it has been adding NAT's url to the beginning of some image searches for quite a while now, causing an error.  I've not tried linking images for a long time and don't know if there is a work-a-round to get the code to post/display images properly.  It appears that your "src=" links are good if the NAT software would not add the bad code.

It seems someone may have recently said that if they "edit" their post and simply "submit" it again, the glitch may be gone.

Good luck.