I did some googling and found nothing but the posts you found :(
Someone said taking the pics off the wall and placing on a surface and then back onto a wall changed something? It wasn't the same problem as yours but it can't hurt.
And I also found this
http://www.modthesims.info/download.php?t=224227&c=1
It won't help your problem but when you get it fixed, it might be fun to put in your game?!? *peers over rose-colored glasses*