After receiving the update, appearing complaints can not download the image in the latest WhatsApp. Complaints came not only from WhatsApp users in one country, but also from other regions. I also experienced it.
How to Fix the "Can't Save Whatsapp Photos/ Video
Just a note, I chose to use the manual download. So download pictures and video does not run automatically. Just a precaution only, so as not to overwhelm all incoming photo gallery.
Instinctively, I changed into an automatic choice. Do not forget to also restart the phone. Sure enough, the image download went smoothly. But I wondered, what about the user alias is not automatic? It turned out that the solution is simple.
So it turns out the problem is quite ridiculous. The solution (actually) is no less ridiculous. Somehow could be like this.
Frankly I do not know if all users of Windows Phone WhatsApp exposed to this problem. But if you're one of them, please try the above. If you have another solution, may also be divided in the comments field.